ZIP(1L)                                                                ZIP(1L)

NAME
       zip - package and compress (archive) files

SYNOPSIS
       zip  [-aABcdDeEfFghjklLmoqrRSTuvVwXyz!@$] [--longoption ...]  [-b path]
       [-n suffixes] [-t date] [-tt date] [zipfile [file ...]]  [-xi list]

       zipcloak (see separate man page)

       zipnote (see separate man page)

       zipsplit (see separate man page)

       Note:  Command line processing in zip has been changed to support  long
       options  and  handle all options and arguments more consistently.  Some
       old command lines that depend on command line  inconsistencies  may  no
       longer work.

DESCRIPTION
       zip  is  a compression and file packaging utility for Unix, VMS, MSDOS,
       OS/2, Windows 9x/NT/XP, Minix,  Atari,  Macintosh,  MVS,  z/OS,  Amiga,
       Acorn RISC, and other OS.  It is analogous to a combination of the Unix
       commands tar(1) and compress(1) (or tar(1) and gzip(1)) and is compati-
       ble  with PKZIP (Phil Katz's ZIP for MSDOS systems) and other major zip
       utilities.

       A companion program (unzip(1L)) unpacks  zip  archives.   The  zip  and
       unzip(1L)  programs  can work with archives produced by most zip utili-
       ties (depending on the features used) and most unzip utilities can work
       with archives produced by zip (though some utilities may still not sup-
       port streamed archives yet).  zip supports most  features  of  the  zip
       standard  up  to PKZIP version 4.6.  zip version 3.1 supports the Zip64
       extensions of PKZIP 4.5 which allow archives as well as files to exceed
       the  previous  2  GB limit (4 GB in some cases).  zip also now supports
       bzip2 compression if the bzip2 library is included  when  zip  is  com-
       piled.   Note  that PKUNZIP 1.10 cannot extract files produced by PKZIP
       2.04 or zip 2.0 (or later).  You must use PKUNZIP 2.04g or  unzip 5.0p1
       (or later versions) to extract them.

       See  the  EXAMPLES  section  at the bottom of this page for examples of
       some typical uses of zip.

       Large Archives and Zip64.  zip automatically uses the Zip64  extensions
       when  files  larger  than 4 GB are added to an archive, an archive con-
       taining Zip64 entries is updated (if the resulting archive still  needs
       Zip64), the size of the archive will exceed 4 GB, or when the number of
       entries in the archive will exceed about 64K.  Zip64 is also  used  for
       archives  streamed from standard input as the size of such archives are
       not known in advance, but the option -fz- can be used to force  zip  to
       create PKZIP 2 compatible archives (as long as Zip64 extensions are not
       needed).  You must use a PKZIP 4.5 compatible unzip, such as  unzip 6.0
       or later, to extract files using the Zip64 extensions.

       Streamed archives.   Streamed archives, entries encrypted with standard
       encryption, or split archives created with the pause option may not  be
       compatible with some utilities as data descriptors are used and they do
       not yet support them, though the latest PKWare published  zip  standard
       now  includes  the data descriptor format zip uses.  Other utilities do
       support these archives, however.  If you run into  problems,  zip  pro-
       vides  a  way  to strip data descriptors from an existing archive using
       the --copy option (if standard encryption was not used).

       Mac OS X.  Though previous Mac versions had their  own  zip  port,  zip
       supports  Mac  OS  X  as  part  of the Unix port and most Unix features
       apply.  References to "MacOS" below generally refer to  MacOS  versions
       older than OS X.  Mac OS X features supported by the Unix port, such as
       resource forks, are identified as UNIX APPLE features.

       For a brief help on zip and unzip,  run  each  without  specifying  any
       parameters on the command line.

USE
       The  program  is  useful for packaging a set of files for distribution;
       for archiving files; and for saving disk space by temporarily compress-
       ing unused files or directories.

       The  zip  program  puts  one or more compressed files into a single zip
       archive, along with information about the files (name, path, date, time
       of  last modification, protection, and check information to verify file
       integrity).  An entire directory structure can be  packed  into  a  zip
       archive  with  a  single command.  Compression ratios of 2:1 to 3:1 are
       common for text files.  zip has one compression method (deflation)  and
       can  also store files without compression.  (If bzip2 support is added,
       zip can also compress using bzip2 compression, but such entries require
       a  reasonably  modern  unzip  to decompress.  When bzip2 compression is
       selected, it replaces deflation as the default method.)  zip  automati-
       cally  chooses  the better of the two (deflation or store, or, if bzip2
       is selected, bzip2 or store) for each file to be compressed.

       Command format.  The basic command format is

              zip options archive inpath inpath ...

       where archive is a new or existing zip archive and inpath is  a  direc-
       tory  or file path optionally including wildcards.  When given the name
       of an existing zip archive, zip will replace identically named  entries
       in  the  zip  archive  (matching  the  relative  names as stored in the
       archive) or add entries for new names.  For example, if foo.zip  exists
       and  contains  foo/file1  and foo/file2, and the directory foo contains
       the files foo/file1 and foo/file3, then:

              zip -r foo.zip foo

       or more concisely

              zip -r foo foo

       will replace foo/file1 in foo.zip and add foo/file3 to foo.zip.   After
       this,  foo.zip  contains  foo/file1,  foo/file2,  and  foo/file3,  with
       foo/file2 unchanged from before.

       So if before the zip command is executed foo.zip has:

               foo/file1 foo/file2

       and directory foo has:

               file1 file3

       then foo.zip will have:

               foo/file1 foo/file2 foo/file3

       where foo/file1 is replaced and foo/file3 is new.

       -@ file lists.  If a file list is specified as -@ [Not on  MacOS],  zip
       takes  the  list of input files from standard input instead of from the
       command line.  For example,

              zip -@ foo

       will store the files listed one per line on stdin in foo.zip.

       Under Unix, this option can be used to powerful effect  in  conjunction
       with  the  find (1)  command.  For example, to archive all the C source
       files in the current directory and its subdirectories:

              find . -name "*.[ch]" -print | zip source -@

       (note that the pattern must be quoted to keep the shell from  expanding
       it).

       Streaming input and output.   zip  will also accept a single dash ("-")
       as the zip file name, in which case it will write the zip file to stan-
       dard  output,  allowing  the output to be piped to another program. For
       example:

              zip -r - . | dd of=/dev/nrst0 obs=16k

       would write the zip output directly to a tape with the specified  block
       size for the purpose of backing up the current directory.

       zip  also  accepts a single dash ("-") as the name of a file to be com-
       pressed, in which case it will  read  the  file  from  standard  input,
       allowing zip to take input from another program. For example:

              tar cf - . | zip backup -

       would compress the output of the tar command for the purpose of backing
       up the current directory. This generally  produces  better  compression
       than  the  previous  example  using  the -r option because zip can take
       advantage of redundancy between files. The backup can be restored using
       the command

              unzip -p backup | tar xf -

       When  no  zip file name is given and stdout is not a terminal, zip acts
       as a filter, compressing standard input to standard output.  For  exam-
       ple,

              tar cf - . | zip | dd of=/dev/nrst0 obs=16k

       is equivalent to

              tar cf - . | zip - - | dd of=/dev/nrst0 obs=16k

       zip  archives  created in this manner can be extracted with the program
       funzip which is provided in the unzip package, or by  gunzip  which  is
       provided  in  the gzip package (but some gunzip may not support this if
       zip used the Zip64 extensions). For example:

              dd if=/dev/nrst0  ibs=16k | funzip | tar xvf -

       The stream can also be saved to a file and unzip used.

       If Zip64 support for large files and archives is  enabled  and  zip  is
       used as a filter, zip creates a Zip64 archive that requires a PKZIP 4.5
       or later compatible unzip to read it.  This is to avoid amgibuities  in
       the  zip  file structure as defined in the current zip standard (PKWARE
       AppNote) where the decision to use Zip64 needs to be made  before  data
       is  written for the entry, but for a stream the size of the data is not
       known at that point.  If the data is known to be smaller than 4 GB, the
       option -fz- can be used to prevent use of Zip64, but zip will exit with
       an error if Zip64 was in fact needed.  zip 3 and unzip 6 and later  can
       read  archives  with Zip64 entries.  Also, zip removes the Zip64 exten-
       sions if not needed  when  archive  entries  are  copied  (see  the  -U
       (--copy) option).

       When directing the output to another file, note that all options should
       be before the redirection including -x.  For example:

              zip archive "*.h" "*.c" -x donotinclude.h orthis.h > tofile

       Zip files.  When changing an existing zip archive,  zip  will  write  a
       temporary file with the new contents, and only replace the old one when
       the process of creating the new  version  has  been  completed  without
       error.   (An  exception is the -g (--grow) option, which appends to the
       original archive.)

       If the name of the zip archive  does  not  contain  an  extension,  the
       extension  .zip  is  added.  If  the name already contains an extension
       other than .zip, the existing extension is  kept  unchanged.   However,
       split  archives  (archives  split over multiple files) require the .zip
       extension on the last split.

       Scanning and reading files.  When zip starts, it  scans  for  files  to
       process  (if  needed).  If this scan takes longer than about 5 seconds,
       zip will display  a  "Scanning  files"  message  and  start  displaying
       progress  dots  every  2  seconds  or  every so many entries processed,
       whichever takes longer.  If there is more than 2 seconds  between  dots
       it  could indicate that finding each file is taking time and could mean
       a slow network connection for example.  (Actually the initial file scan
       is  a  two-step  process where the directory scan is followed by a sort
       and these two steps are separated with a space in the dots.  If  updat-
       ing an existing archive, a space also appears between the existing file
       scan and the new file scan.)  The scanning  files  dots  are  not  con-
       trolled  by the -ds dot size option, but the dots are turned off by the
       -q quiet option.  The -sf show files option can be  used  to  scan  for
       files  and  get  the  list of files scanned without actually processing
       them.

       If zip is not able to read a file, it issues a warning  but  continues.
       See  the -MM option below for more on how zip handles patterns that are
       not matched and files that  are  not  readable.   If  some  files  were
       skipped, a warning is issued at the end of the zip operation noting how
       many files were read and how many skipped.

       Command modes.  zip now supports two distinct types of  command  modes,
       external  and  internal.  The external modes (add, update, and freshen)
       read files from the file system (as well as from an  existing  archive)
       while  the  internal  modes  (delete  and  copy) operate exclusively on
       entries in an existing archive.

       add
              Update existing entries and add new files.  If the archive  does
              not exist create it.  This is the default mode.

       update (-u)
              Update  existing entries if newer on the file system and add new
              files.  If the archive does not exist, issue a warning and  then
              create a new archive.

       freshen (-f)
              Update  existing entries of an archive if newer on the file sys-
              tem.  Does not add new files to the archive.

       delete (-d)
              Select entries in an existing archive and delete them.

       copy (-U)
              Select entries in an existing archive and copy  them  to  a  new
              archive.   This  new  mode is similar to update but command line
              patterns select entries in  the  existing  archive  rather  than
              files from the file system and it uses the --out option to write
              the resulting archive to a  new  file  rather  than  update  the
              existing archive, leaving the original archive unchanged.

       The new File Sync option (-FS) is also considered a new mode, though it
       is similar to update.  This mode  synchronizes  the  archive  with  the
       files  on  the OS, only replacing files in the archive if the file time
       or size of the OS file is different, adding  new  files,  and  deleting
       entries from the archive where there is no matching file.  As this mode
       can delete entries from the archive, consider making a backup  copy  of
       the archive.

       Also see -DF for creating difference archives.

       See  each option description below for details and the EXAMPLES section
       below for examples.

       Split archives.  zip version 3.0 and later can create  split  archives.
       A  split  archive  is a standard zip archive split over multiple files.
       (Note that split archives are not just archives split in to pieces,  as
       the  offsets of entries are now based on the start of each split.  Con-
       catenating the pieces together will invalidate these offsets, but unzip
       can  usually  deal  with it.  zip will usually refuse to process such a
       spliced archive unless the -FF fix option is used to fix the  offsets.)

       One use of split archives is storing a large archive on multiple remov-
       able media.  For a split archive with 20 split files the files are typ-
       ically   named   (replace  ARCHIVE  with  the  name  of  your  archive)
       ARCHIVE.z01, ARCHIVE.z02, ..., ARCHIVE.z19, ARCHIVE.zip.  Note that the
       last  file  is  the  .zip  file.  In contrast, spanned archives are the
       original multi-disk archive generally requiring floppy disks and  using
       volume  labels  to store disk numbers.  zip supports split archives but
       not spanned archives, though a procedure exists  for  converting  split
       archives  of  the  right size to spanned archives.  The reverse is also
       true, where each file of a spanned archive can be copied  in  order  to
       files with the above names to create a split archive.

       Use  -s  to set the split size and create a split archive.  The size is
       given as a number followed optionally by one of k (kB), m (MB), g (GB),
       or  t (TB) (the default is m).  The -sp option can be used to pause zip
       between splits to allow changing removable media, for example, but read
       the descriptions and warnings for both -s and -sp below.

       Though  zip does not update split archives, zip provides the new option
       -O (--output-file or --out) to allow split archives to be  updated  and
       saved in a new archive.  For example,

              zip inarchive.zip foo.c bar.c --out outarchive.zip

       reads  archive  inarchive.zip,  even if split, adds the files foo.c and
       bar.c, and writes the resulting archive to  outarchive.zip.   If  inar-
       chive.zip is split then outarchive.zip defaults to the same split size.
       Be aware that if outarchive.zip and any split files  that  are  created
       with  it  already exist, these are always overwritten as needed without
       warning.  This may be changed in the future.

       Unicode.  Though the zip standard requires storing paths in an  archive
       using  a  specific character set, in practice zips have stored paths in
       archives in whatever the local character set is.  This creates problems
       when  an  archive is created or updated on a system using one character
       set and then extracted on another system using  a  different  character
       set.  When compiled with Unicode support enabled on platforms that sup-
       port wide characters, zip now stores, in addition to the standard local
       path  for  backward  compatibility,  the UTF-8 translation of the path.
       This provides a common universal character set for storing  paths  that
       allows  these paths to be fully extracted on other systems that support
       Unicode and to match as closely as possible on systems that don't.

       On Win32 systems where paths are internally stored as Unicode but  rep-
       resented in the local character set, it's possible that some paths will
       be skipped during a local character set directory scan.  zip with  Uni-
       code support now can read and store these paths.  Note that Win 9x sys-
       tems and FAT file systems don't fully support Unicode.

       Be aware that console windows on Win32 and Unix, for example, sometimes
       don't  accurately  show all characters due to how each operating system
       switches in character sets for display.  However, directory  navigation
       tools should show the correct paths if the needed fonts are loaded.

       Command line format.  This version of zip has updated command line pro-
       cessing and support for long options.

       Short options take the form

              -s[-][s[-]...][value][=value][ value]

       where s is a one or two character short option.  A  short  option  that
       takes  a value is last in an argument and anything after it is taken as
       the value.  If the option can be negated and  "-"  immediately  follows
       the  option, the option is negated.  Short options can also be given as
       separate arguments

              -s[-][value][=value][ value] -s[-][value][=value][ value] ...

       Short options in general take values either as part of the  same  argu-
       ment  or  as  the following argument.  An optional = is also supported.
       So

              -ttmmddyyyy

       and

              -tt=mmddyyyy

       and

              -tt mmddyyyy

       all work.  The -x and -i options accept  lists  of  values  and  use  a
       slightly  different format described below.  See the -x and -i options.

       Long options take the form

              --longoption[-][=value][ value]

       where the option starts with --, has a multicharacter name, can include
       a  trailing  dash to negate the option (if the option supports it), and
       can have a value (option argument) specified by preceeding  it  with  =
       (no spaces).  Values can also follow the argument.  So

              --before-date=mmddyyyy

       and

              --before-date mmddyyyy

       both work.

       Long option names can be shortened to the shortest unique abbreviation.
       See the option descriptions below for which support long  options.   To
       avoid confusion, avoid abbreviating a negatable option with an embedded
       dash ("-") at the dash if you plan to negate it (the parser would  con-
       sider  a  trailing  dash,  such  as  for the option --some-option using
       --some- as the option, as part of  the  name  rather  than  a  negating
       dash).   This  may  be  changed to force the last dash in --some- to be
       negating in the future.

OPTIONS
       -a
       --ascii
              [Systems using EBCDIC] Translate file to ASCII format.

       -aa
       --all-ascii
              Handle all files as ASCII text files.  This is mainly to support
              EBCDIC/ASCII conversions.

       -A
       --adjust-sfx
              Adjust  self-extracting  executable  archive.  A self-extracting
              executable archive is created by prepending the SFX stub  to  an
              existing  archive.  The  -A option tells zip to adjust the entry
              offsets stored in the archive to take into account this  "pream-
              ble" data.

       Note:  self-extracting  archives  for the Amiga are a special case.  At
       present, only the Amiga port of zip is capable of adjusting or updating
       these without corrupting them. -J can be used to remove the SFX stub if
       other updates need to be made.

       -AC
       --archive-clear
              [WIN32]  Once archive is created (and  tested  if  -T  is  used,
              which  is  recommended),  clear  the  archive bits of files pro-
              cessed.  WARNING: Once the bits are cleared  they  are  cleared.
              You  may want to use the -sf show files option to store the list
              of files  processed  in  case  the  archive  operation  must  be
              repeated.   Also  consider  using the -MM must match option.  Be
              sure to check out -DF as a possibly better way to do incremental
              backups.

       -AS
       --archive-set
              [WIN32]   Only  include  files  that  have  the archive bit set.
              Directories are not stored when -AS is used, though  by  default
              the paths of entries, including directories, are stored as usual
              and can be used by most unzips to recreate directories.

              The archive bit is set by the operating system when  a  file  is
              modified  and,  if used with -AC, -AS can provide an incremental
              backup capability.  However, other applications can  modify  the
              archive  bit  and  it  may  not be a reliable indicator of which
              files have changed since the last archive  operation.   Alterna-
              tive ways to create incremental backups are using -t to use file
              dates, though this won't catch old files copied  to  directories
              being archived, and -DF to create a differential archive.

       -as
       --sequester
              [UNIX  APPLE]  Save Apple Double resource files in a sequestered
              directory, instead of in the directory where the data fork  file
              is.

       -B
       --binary
              [VM/CMS and MVS] force file to be read binary (default is text).

       -Bn    [TANDEM] set Edit/Enscribe formatting options with n defined as
              bit  0: Don't add delimiter (Edit/Enscribe)
              bit  1: Use LF rather than CR/LF as delimiter (Edit/Enscribe)
              bit  2: Space fill record to maximum record length (Enscribe)
              bit  3: Trim trailing space (Enscribe)
              bit  8: Force 30K (Expand) large read for unstructured files

       -b path
       --temp-path path
              Use the specified path for the temporary zip archive. For  exam-
              ple:

                     zip -b /tmp stuff *

              will  put the temporary zip archive in the directory /tmp, copy-
              ing over stuff.zip to the  current  directory  when  done.  This
              option  is useful when updating an existing archive and the file
              system containing this old archive does not have enough space to
              hold both old and new archives at the same time.  It may also be
              useful when streaming in some cases to avoid the need  for  data
              descriptors.   Note  that using this option may require zip take
              additional time to copy the archive file when done to the desti-
              nation file system.

       -c
       --entry-comments
              Add  one-line  comments for each file.  File operations (adding,
              updating) are done first, and the user is then  prompted  for  a
              one-line  comment  for each file.  Enter the comment followed by
              return, or just return for no comment.

       -C
       --preserve-case
              [VMS]  Preserve case all on VMS.   Negating  this  option  (-C-)
              downcases.

       -C2
       --preserve-case-2
              [VMS]   Preserve  case ODS2 on VMS.  Negating this option (-C2-)
              downcases.  Default:  -C2- (downcase ODS2 names).

       -C5
       --preserve-case-5
              [VMS]  Preserve case ODS5 on VMS.  Negating this  option  (-C5-)
              downcases.  Default:  -C5 (preserve case of ODS5 names).

       -d
       --delete
              Remove (delete) entries from a zip archive.  For example:

                     zip -d foo foo/tom/junk foo/harry/\* \*.o

              will  remove the entry foo/tom/junk, all of the files that start
              with foo/harry/, and all of the files that end with .o  (in  any
              path).   Note  that  shell pathname expansion has been inhibited
              with backslashes, so that zip can see  the  asterisks,  enabling
              zip  to  match on the contents of the zip archive instead of the
              contents of the current directory.   (The  backslashes  are  not
              used  on  MSDOS-based or VMS platforms.)  Can also use quotes to
              escape the asterisks as in

                     zip -d foo foo/tom/junk "foo/harry/*" "*.o"

              Not escaping the asterisks on a system where the  shell  expands
              wildcards  could  result  in  the asterisks being converted to a
              list of files in the current directory and  that  list  used  to
              delete entries from the archive.

              Under  MSDOS,  -d is case sensitive when it matches names in the
              zip archive.  This requires that file names be entered in  upper
              case  if they were zipped by PKZIP on an MSDOS system.  (We con-
              sidered making this case insensitive on systems where paths were
              case  insensitive,  but  it  is possible the archive came from a
              system where case does matter and the archive could include both
              Bar  and bar as separate files in the archive.)  But see the new
              option -ic to ignore case in the archive.

       -db
       --display-bytes
              Display running byte counts showing the  bytes  zipped  and  the
              bytes to go.

       -dc
       --display-counts
              Display running count of entries zipped and entries to go.

       -dd
       --display-dots
              Display  dots  while  each entry is zipped (except on ports that
              have their own progress indicator).  See -ds below  for  setting
              dot  size.   The default is a dot every 10 MB of input file pro-
              cessed.  The -v option also displays dots (previously at a  much
              higher  rate  than  this  but now -v also defaults to 10 MB) and
              this rate is also controlled by -ds.

       -df
       --datafork
              [MacOS, UNIX APPLE] Include only the data-forks of files  zipped
              into  the  archive.   Resource  forks  and  Finder  info will be
              ignored.  This is useful for exporting files to foreign  operat-
              ing systems where the resource information is not useful.

       -dg
       --display-globaldots
              Display  progress dots for the archive instead of for each file.
              The command

                         zip -qdgds 10m

              will turn off most output except dots every 10 MB.

       -ds size
       --dot-size size
              Set amount of input file processed for each dot displayed.   See
              -dd to enable displaying dots.  Setting this option implies -dd.
              Size is in the format nm where n is a number and m is  a  multi-
              plier.  Currently m can be k (KB), m (MB), g (GB), or t (TB), so
              if n is 100 and m is k, size would be 100k which is 100 KB.  The
              default is 10 MB.

              The -v option also displays dots and now defaults to 10 MB also.
              This rate is also controlled by this option.  A size of 0  turns
              dots off.

              This  option does not control the dots from the "Scanning files"
              message as zip scans for input files.  The dot size for that  is
              fixed  at  2  seconds or a fixed number of entries, whichever is
              longer.

       -du
       --display-usize
              Display the uncompressed size of each entry.

       -dv
       --display-volume
              Display the volume (disk) number each entry is being read  from,
              if reading an existing archive, and being written to.

       -D
       --no-dir-entries
              Do  not  create  entries  in  the  zip  archive for directories.
              Directory  entries  are  created  by  default  so   that   their
              attributes  can  be  saved  in the zip archive.  The environment
              variable ZIPOPT can be used to change the default  options.  For
              example under Unix with sh:

                     ZIPOPT="-D"; export ZIPOPT

              (The  variable  ZIPOPT  can be used for any option, including -i
              and -x using a new option format detailed below, and can include
              several  options.)  The option -D is a shorthand for -x "*/" but
              the latter previously could not be set as default in the  ZIPOPT
              environment  variable  as  the  contents of ZIPOPT gets inserted
              near the beginning of the command line and the file list had  to
              end at the end of the line.

              This  version  of  zip does allow -x and -i options in ZIPOPT if
              the form

              -x file file ... @

              is used, where the @ (an argument that is just @) terminates the
              list.

       -DF
       --difference-archive
              Create  an archive that contains all new and changed files since
              the original archive was created.  For this to work,  the  input
              file  list  and current directory must be the same as during the
              original zip operation.

              For example, if the existing archive was created using

                     zip -r foofull .

              from the bar directory, then the command

                     zip -r foofull . -DF --out foonew

              also from the bar directory creates the archive foonew.zip  with
              just  the  files not in foofull.zip and the files where the size
              or file time of the files do not match those in foofull.zip.

              Note that the timezone environment variable  TZ  should  be  set
              according to the local timezone in order for this option to work
              correctly.  A change in timezone since the original archive  was
              created  could  result  in no times matching and all files being
              included.

              A possible approach to backing up a directory might be to create
              a  normal  archive  of  the  contents of the directory as a full
              backup, then use this option to create incremental backups.

       -e
       --encrypt
              Encrypt the contents of the zip archive using a  password  which
              is  entered  on  the terminal in response to a prompt (this will
              not be echoed; if standard error is not a  tty,  zip  will  exit
              with  an  error).   The  password is requested twice to save the
              user from typing errors.

       -E
       --longnames
              [OS/2] Use the .LONGNAME Extended Attribute (if found) as  file-
              name.

       -f
       --freshen
              Replace  (freshen)  an existing entry in the zip archive only if
              it has been modified more recently than the version  already  in
              the zip archive; unlike the update option (-u) this will not add
              files that are not already in the zip archive.  For example:

                     zip -f foo

              This command should be run from the same  directory  from  which
              the  original  zip  command  was  run, since paths stored in zip
              archives are always relative.

              Note that the timezone environment variable  TZ  should  be  set
              according  to  the local timezone in order for the -f, -u and -o
              options to work correctly.

              The reasons behind this are somewhat subtle but have to do  with
              the  differences  between  the Unix-format file times (always in
              GMT) and most of the other operating systems (always local time)
              and  the  necessity  to  compare the two.  A typical TZ value is
              ``MET-1MEST'' (Middle European time  with  automatic  adjustment
              for ``summertime'' or Daylight Savings Time).

              The  format is TTThhDDD, where TTT is the time zone such as MET,
              hh is the difference between GMT  and  local  time  such  as  -1
              above, and DDD is the time zone when daylight savings time is in
              effect.  Leave off the DDD if there is no daylight savings time.
              For the US Eastern time zone EST5EDT.

       -F
       --fix
       -FF
       --fixfix
              Fix  the zip archive. The -F option can be used if some portions
              of the archive are missing, but  requires  a  reasonably  intact
              central  directory.   The input archive is scanned as usual, but
              zip will ignore some problems.  The resulting archive should  be
              valid, but any inconsistent entries will be left out.

              When  doubled  as in -FF, the archive is scanned from the begin-
              ning and zip scans for special signatures to identify the limits
              between  the  archive members. The single -F is more reliable if
              the archive is not too much damaged, so try this option first.

              If the archive is too damaged or the end has been truncated, you
              must  use  -FF.   This  is  a change from zip 2.32, where the -F
              option is able to read a truncated archive.  The -F  option  now
              more  reliably  fixes  archives  with  minor  damage and the -FF
              option is needed to fix archives where -F might have been suffi-
              cient before.

              Neither  option will recover archives that have been incorrectly
              transferred in ascii mode instead of binary. After  the  repair,
              the  -t option of unzip may show that some files have a bad CRC.
              Such files cannot be recovered; you can  remove  them  from  the
              archive using the -d option of zip.

              Note  that  -FF may have trouble fixing archives that include an
              embedded zip archive that was stored  (without  compression)  in
              the  archive  and,  depending  on  the  damage,  it may find the
              entries in the embedded archive rather than the archive  itself.
              Try -F first as it does not have this problem.

              The  format  of  the fix commands have changed.  For example, to
              fix the damaged archive foo.zip,

                     zip -F foo --out foofix

              tries to read the entries normally, copying good entries to  the
              new  archive  foofix.zip.   If  this  doesn't  work, as when the
              archive is truncated, or if some entries you  know  are  in  the
              archive are missed, then try

                     zip -FF foo --out foofixfix

              and  compare the resulting archive to the archive created by -F.
              The -FF option may create an inconsistent archive.  Depending on
              what  is  damaged,  you  can  then use the -F option to fix that
              archive.

              A split archive with missing split files can be fixed  using  -F
              if  you  have the last split of the archive (the .zip file).  If
              this file is missing, you must use -FF to fix the archive, which
              will prompt you for the splits you have.

              Currently  the fix options can't recover entries that have a bad
              checksum or are otherwise damaged.

       -FI
       --fifo
              [Unix]  Normally zip  skips  reading  any  FIFOs  (named  pipes)
              encountered, as zip can hang if the FIFO is not being fed.  This
              option tells zip to read the contents of any FIFO it finds.

       -FS
       --filesync
              Synchronize the contents of an archive with the files on the OS.
              Normally  when  an  archive  is updated, new files are added and
              changed files are updated but files that no longer exist on  the
              OS  are not deleted from the archive.  This option enables a new
              mode that checks entries in the archive against the file system.
              If  the file time and file size of the entry matches that of the
              OS file, the entry is copied from the  old  archive  instead  of
              being  read from the file system and compressed.  If the OS file
              has changed, the entry is read and compressed as usual.  If  the
              entry  in the archive does not match a file on the OS, the entry
              is deleted.  Enabling this option should  create  archives  that
              are  the  same  as  new archives, but since existing entries are
              copied instead of compressed, updating an existing archive  with
              -FS  can  be much faster than creating a new archive.  Also con-
              sider using -u for updating an archive.

              For this option to work, the archive should be updated from  the
              same  directory  it  was created in so the relative paths match.
              If few files are being copied from the old archive,  it  may  be
              faster to create a new archive instead.

              Note  that  the  timezone  environment variable TZ should be set
              according to the local timezone in order for this option to work
              correctly.   A change in timezone since the original archive was
              created could result in no times matching and  recompression  of
              all files.

              This option deletes files from the archive.  If you need to pre-
              serve the original archive, make a copy of the archive first  or
              use  the  --out  option  to  output the updated archive to a new
              file.  Even though it may be slower, creating a new archive with
              a  new  archive name is safer, avoids mismatches between archive
              and OS paths, and is preferred.

       -g
       --grow
              Grow (append to) the specified zip archive, instead of  creating
              a  new  one.   This  can be fast if only a few entries are being
              added, as any old entries remain where they are in  the  archive
              as  new  entries  are  appended.   If  this operation fails, zip
              attempts to restore the archive to its original  state.  If  the
              restoration  fails,  the  archive  might  become corrupted. This
              option is ignored when there's no existing archive  or  when  at
              least one archive member must be updated or deleted.

       -h
       -?
       --help
              Display  the  zip  help information (this also appears if zip is
              run with no arguments).

       -h2
       -hh
       -HH
       --more-help
              Display extended help including more  on  command  line  format,
              pattern matching, and more obscure options.

       -i files
       --include files
              Include only the specified files, as in:

                     zip -r foo . -i \*.c

              which  will include only the files that end in .c in the current
              directory and its subdirectories. (Note  for  PKZIP  users:  the
              equivalent command is

                     pkzip -rP foo *.c

              PKZIP  does  not  allow  recursion in directories other than the
              current one.)  The backslash avoids shell filename substitution,
              so  that  the name matching is performed by zip at all directory
              levels.  [This is for Unix and other systems where \ escapes the
              next character, in this case preventing the shell from replacing
              * with a list of files in the current directory.  For other sys-
              tems  where  the shell does not expand * (does not do file glob-
              bing), do not use \ (as on MSDOS, for  example,  this  would  be
              handled  as  a  directory  separator,  which may not be what you
              want) and the above would be

                     zip -r foo . -i *.c

              Examples are  for  Unix  unless  otherwise  specified.]   So  to
              include  dir,  a directory directly under the current directory,
              use

                     zip -r foo . -i dir/\*

              or

                     zip -r foo . -i "dir/*"

              to match paths such as dir/a and dir/b/file.c [on ports  without
              wildcard expansion in the shell such as MSDOS and Windows

                     zip -r foo . -i dir/*

              is  used.]   Note  that  currently  the trailing / is needed for
              directories (as in

                     zip -r foo . -i dir/

              to include directory dir).

              The long option form of the first example is

                     zip -r foo . --include \*.c

              and does the same thing as the short option form.

              Though the command syntax used to require -i at the end  of  the
              command  line,  this  version  actually allows -i (or --include)
              anywhere.  The list of files terminates  at  the  next  argument
              starting with -, the end of the command line, or the list termi-
              nator @ (an argument that is just @).  So the above can be given
              as

                     zip -i \*.c @ -r foo .

              for  example.   There must be a space between the option and the
              first file of a list.  For just one file you can use the  single
              value form

                     zip -i\*.c -r foo .

              (no space between option and value) or

                     zip --include=\*.c -r foo .

              as  additional  examples.  The single value forms are not recom-
              mended because they can be confusing  and,  in  particular,  the
              -ifile  format  can  cause  problems if the first letter of file
              combines with i to form a two-letter  option  starting  with  i.
              Use -sc to see how your command line will be parsed.

              Also possible:

                     zip -r foo  . -i@include.lst

              which  will  only include the files in the current directory and
              its  subdirectories  that  match  the  patterns  in   the   file
              include.lst.

              Files to -i and -x are patterns matching internal archive paths.
              See -R for more on patterns.

       -I
       --no-image
              [Acorn RISC OS] Don't scan through Image files.  When used,  zip
              will  not  consider  Image  files  (eg.  DOS partitions or Spark
              archives when SparkFS is loaded) as directories but  will  store
              them as single files.

              For example, if you have SparkFS loaded, zipping a Spark archive
              will result in a zipfile containing a directory  (and  its  con-
              tent)  while  using the 'I' option will result in a zipfile con-
              taining a Spark archive. Obviously this second case will also be
              obtained (without the 'I' option) if SparkFS isn't loaded.

       -ic
       --ignore-case
              [VMS,  WIN32]  Ignore  case when matching archive entries.  This
              option is only available on systems where the case of  files  is
              ignored.  On systems with case-insensitive file systems, case is
              normally ignored when matching files on the file system  but  is
              not  ignored for -f (freshen), -d (delete), -U (copy), and simi-
              lar modes when matching against archive  entries  (currently  -f
              ignores case on VMS) because archive entries can be from systems
              where case does matter and names that are the  same  except  for
              case can exist in an archive.  The -ic option makes all matching
              case insensitive.  This can result in multiple  archive  entries
              matching a command line pattern.

       -j
       --junk-paths
              Store  just the name of a saved file (junk the path), and do not
              store directory names. By default, zip will store the full  path
              (relative to the current directory).

       -jj
       --absolute-path
              [MacOS] record Fullpath (+ Volname). The complete path including
              volume will be stored. By default  the  relative  path  will  be
              stored.

       -J
       --junk-sfx
              Strip any prepended data (e.g. a SFX stub) from the archive.

       -k
       --DOS-names
              Attempt  to  convert  the  names  and paths to conform to MSDOS,
              store only the MSDOS attribute (just the  user  write  attribute
              from  Unix), and mark the entry as made under MSDOS (even though
              it was not); for compatibility with PKUNZIP  under  MSDOS  which
              cannot handle certain names such as those with two dots.

       -l
       --to-crlf
              Translate  the Unix end-of-line character LF into the MSDOS con-
              vention CR LF. This option should not be used on  binary  files.
              This  option can be used on Unix if the zip file is intended for
              PKUNZIP under MSDOS. If the input files already contain  CR  LF,
              this option adds an extra CR. This is to ensure that unzip -a on
              Unix will get back an exact copy of the original file,  to  undo
              the effect of zip -l.  See -ll for how binary files are handled.

       -la
       --log-append
              Append to existing logfile.  Default is to overwrite.

       -lf logfilepath
       --logfile-path logfilepath
              Open a logfile at the given path.  By default any existing  file
              at  that location is overwritten, but the -la option will result
              in an existing file being opened and  the  new  log  information
              appended  to any existing information.  Only warnings and errors
              are written to the log unless the -li option is also given, then
              all information messages are also written to the log.

       -li
       --log-info
              Include  information  messages, such as file names being zipped,
              in the log.  The default is to only include  the  command  line,
              any warnings and errors, and the final status.

       -ll
       --from-crlf
              Translate the MSDOS end-of-line CR LF into Unix LF.  This option
              should not be used on binary files.  This option can be used  on
              MSDOS  if the zip file is intended for unzip under Unix.  If the
              file is converted and the file is later determined to be  binary
              a warning is issued and the file is probably corrupted.  In this
              release if -ll detects binary in the first buffer  read  from  a
              file,  zip now issues a warning and skips line end conversion on
              the file.  This check seems to catch all  binary  files  tested,
              but  the original check remains and if a converted file is later
              determined to be binary that warning is  still  issued.   A  new
              algorithm  is  now  being  used for binary detection that should
              allow line end conversion of text files  in  UTF-8  and  similar
              encodings.

       -L
       --license
              Display the zip license.

       -m
       --move
              Move  the  specified  files into the zip archive; actually, this
              deletes the target directories/files after making the  specified
              zip  archive.  If a directory becomes empty after removal of the
              files, the directory is also  removed.  No  deletions  are  done
              until zip has created the archive without error.  This is useful
              for conserving disk space, but is potentially dangerous so it is
              recommended to use it in combination with -T to test the archive
              before removing all input files.

       -MM
       --must-match
              All input patterns must match at least one file  and  all  input
              files  found  must  be readable.  Normally when an input pattern
              does not match a file the "name not matched" warning is  issued,
              and  when  an  input file has been found but later is missing or
              not readable a "could not open" warning is  issued.   In  either
              case zip continues creating the archive, with missing or unread-
              able new files being skipped and files already  in  the  archive
              remaining unchanged.  After the archive is created, if any files
              were not readable zip returns the OPEN error code  (18  on  most
              systems)  instead  of  the normal success return (0 on most sys-
              tems).  With -MM set, zip exits as soon as an input  pattern  is
              not  matched  (whenever  the "name not matched" warning would be
              issued) or when an input file is not readable.  In  either  case
              zip exits with an OPEN error and no archive is created.

              This option is useful when a known list of files is to be zipped
              so any missing or unreadable files will result in an error.   It
              is less useful when used with wildcards, but zip will still exit
              with an error if any input pattern doesn't match  at  least  one
              file  and  if  any matched files are unreadable.  If you want to
              create the archive anyway and only need to know  if  files  were
              skipped, don't use -MM and just check the return code.  Also -lf
              could be useful.

       -MV m
       --MVS-mode m
              [MVS] Set the MVS path translation mode to m.  Paths on MVS  are
              generally  in  the form aa.bb.cc.dd, where the dots separate the
              parts of the path.  To make these  paths  more  compatible  with
              non-MVS  systems, zip converts the dots to slashes.  The default
              translation has caused problems, however,  so  this  option  now
              allows control of how the paths are translated.  m can be:

              dots  - Store paths as they are on the file system (typically in
              the form aa.bb.cc.dd).

              slashes - Change MVS paths in form aa.bb.cc.dd (using  dots)  to
              aa/bb/cc/dd (using slashes).

              lastdot  - Change paths in form aa.bb.cc.dd to aa/bb/cc.dd where
              all but the last dot is  converted  to  slashes.   This  is  the
              default for backward compatibility and is probably the most com-
              patible format for old MSDOS 8.3 file systems.

              m can be appreviated to the first letter.

       -n suffixes
       --suffixes suffixes
              Do not attempt to compress files named with the given  suffixes.
              Such  files are simply stored (0% compression) in the output zip
              file, so that zip doesn't waste  its  time  trying  to  compress
              them.   The  suffixes  are  separated  by either colons or semi-
              colons.  For example:

                     zip -rn .Z:.zip:.tiff:.gif:.snd  foo foo

              will copy everything from foo into foo.zip, but will  store  any
              files  that end in .Z, .zip, .tiff, .gif, or .snd without trying
              to compress them (image and sound files  often  have  their  own
              specialized compression methods).  By default, zip does not com-
              press     files     with     extensions     in     the      list
              .Z:.zip:.zoo:.arc:.lzh:.arj.   Such files are stored directly in
              the output archive.  The environment variable ZIPOPT can be used
              to change the default options. For example under Unix with csh:

                     setenv ZIPOPT "-n .gif:.zip"

              To attempt compression on all files, use:

                     zip -n : foo

              The  maximum  compression option -9 also attempts compression on
              all files regardless of extension.

              On Acorn RISC OS systems the suffixes are actually filetypes  (3
              hex  digit format). By default, zip does not compress files with
              filetypes in the list DDC:D96:68E (i.e. Archives, CFS files  and
              PackDir files).

       -nw
       --no-wild
              Do not perform internal wildcard processing (shell processing of
              wildcards is still done by the shell unless  the  arguments  are
              escaped).   Useful if a list of paths is being read and no wild-
              card substitution is desired.

       -N
       --notes
              [Amiga, MacOS] Save Amiga or MacOS  filenotes  as  zipfile  com-
              ments.  They can be restored by using the -N option of unzip. If
              -c is used also, you are prompted for comments  only  for  those
              files that do not have filenotes.

       -o
       --latest-time
              Set  the  "last  modified" time of the zip archive to the latest
              (oldest) "last modified" time found among the entries in the zip
              archive.   This  can  be  used  without any other operations, if
              desired.  For example:

              zip -o foo

              will change the last modified time of foo.zip to the latest time
              of the entries in foo.zip.

       -O output-file
       --output-file output-file
              Process  the  archive  changes as usual, but instead of updating
              the existing archive, output the  new  archive  to  output-file.
              Useful  for  updating  an  archive without changing the existing
              archive and the input archive must be a different file than  the
              output archive.

              This  option  can  be used to create updated split archives.  It
              can also be used with  -U  to  copy  entries  from  an  existing
              archive to a new archive.  See the EXAMPLES section below.

              Another  use  is  converting  zip  files  from one split size to
              another.  For instance, to convert an archive  with  700  MB  CD
              splits to one with 2 GB DVD splits, can use:

                     zip -s 2g cd-split.zip --out dvd-split.zip

              which uses copy mode.  See -U below.  Also:

                     zip -s 0 split.zip --out unsplit.zip

              will convert a split archive to a single-file archive.

              Copy  mode  will  convert stream entries (using data descriptors
              and which should be  compatible  with  most  unzips)  to  normal
              entries  (which should be compatible with all unzips), except if
              standard encryption  was  used.   For  archives  with  encrypted
              entries,  zipcloak  will decrypt the entries and convert them to
              normal entries.

       -p
       --paths
              Include relative file paths as part of the names of files stored
              in  the  archive.  This is the default.  The -j option junks the
              paths and just stores the names of the files.

       -pp prefx
       --prefix-path prefx
              Prefix all paths in the archive  with  the  string  prefx.   The
              string  must  include  only alphanumeric and limited punctuation
              characters.  No spaces are allowed.  Slashes are allowed so that
              the prefix can put the archive contents into a directory.

       -P password
       --password password
              Use password to encrypt zipfile entries (if any).  THIS IS INSE-
              CURE!  Many multi-user operating systems provide  ways  for  any
              user  to see the current command line of any other user; even on
              stand-alone systems there is  always  the  threat  of  over-the-
              shoulder  peeking.   Storing the plaintext password as part of a
              command line in an automated script  is  even  worse.   Whenever
              possible, use the non-echoing, interactive prompt to enter pass-
              words.  (And where  security  is  truly  important,  use  strong
              encryption such as Pretty Good Privacy instead of the relatively
              weak standard encryption provided by zipfile utilities.)

       -q
       --quiet
              Quiet  mode;  eliminate  informational  messages   and   comment
              prompts.   (Useful, for example, in shell scripts and background
              tasks).

       -Qn
       --Q-flag n
              [QDOS] store information about the file in the file header  with
              n defined as
              bit  0: Don't add headers for any file
              bit  1: Add headers for all files
              bit  2: Don't wait for interactive key press on exit

       -r
       --recurse-paths
              Travel the directory structure recursively; for example:

                     zip -r foo.zip foo

              or more concisely

                     zip -r foo foo

              In  this case, all the files and directories in foo are saved in
              a zip archive named foo.zip, including files with names starting
              with ".", since the recursion does not use the shell's file-name
              substitution mechanism.  If you wish to include only a  specific
              subset of the files in directory foo and its subdirectories, use
              the -i option to specify the pattern of files  to  be  included.
              You  should  not  use  -r with the name ".*", since that matches
              ".."  which will attempt to zip up the parent directory  (proba-
              bly not what was intended).

              Multiple source directories are allowed as in

                     zip -r foo foo1 foo2

              which  first  zips up foo1 and then foo2, going down each direc-
              tory.

              Note that while wildcards to -r  are  typically  resolved  while
              recursing  down  directories in the file system, any -R, -x, and
              -i wildcards are applied to internal archive pathnames once  the
              directories  are  scanned.   To have wildcards apply to files in
              subdirectories when recursing on Unix and similar systems  where
              the  shell  does  wildcard substitution, either escape all wild-
              cards or put all arguments with wildcards in quotes.  This  lets
              zip  see  the  wildcards and match files in subdirectories using
              them as it recurses.

       -R
       --recurse-patterns
              Travel the directory structure recursively starting at the  cur-
              rent directory; for example:

                     zip -R foo "*.c"

              In this case, all the files matching *.c in the tree starting at
              the current directory  are  stored  into  a  zip  archive  named
              foo.zip.   Note that *.c will match file.c, a/file.c and a/b/.c.
              More than one pattern can be listed as separate arguments.  Note
              for PKZIP users: the equivalent command is

                     pkzip -rP foo *.c

              Patterns  are relative file paths as they appear in the archive,
              or will after zipping, and can have optional wildcards in  them.
              For example, given the current directory is foo and under it are
              directories foo1 and foo2 and in foo1 is the file bar.c,

                     zip -R foo/*

              will zip up foo, foo/foo1, foo/foo1/bar.c, and foo/foo2.

                     zip -R */bar.c

              will zip up foo/foo1/bar.c.  See the note  for  -r  on  escaping
              wildcards.

       -RE
       --regex
              [WIN32]   Before  zip  3.0, regular expression list matching was
              enabled by default on Windows platforms.  Because  of  confusion
              resulting  from  the  need to escape "[" and "]" in names, it is
              now off by default for Windows so "[" and "]"  are  just  normal
              characters in names.  This option enables [] matching again.

       -s splitsize
       --split-size splitsize
              Enable creating a split archive and set the split size.  A split
              archive is an archive that could be split over many  files.   As
              the  archive  is created, if the size of the archive reaches the
              specified split size, that split is closed and  the  next  split
              opened.   In  general  all splits but the last will be the split
              size and the last will be  whatever  is  left.   If  the  entire
              archive  is smaller than the split size a single-file archive is
              created.

              Split archives are stored in numbered files.   For  example,  if
              the  output  archive  is  named  archive  and  three  splits are
              required, the resulting archive  will  be  in  the  three  files
              archive.z01,  archive.z02,  and  archive.zip.  Do not change the
              numbering of these files or the archive will not be readable  as
              these are used to determine the order the splits are read.

              Split  size  is  a  number  optionally followed by a multiplier.
              Currently the number must be an  integer.   The  multiplier  can
              currently be one of k (kilobytes), m (megabytes), g (gigabytes),
              or t (terabytes).  (Note that these are powers of 2, so k = 1024
              and  so  on.)  As 64k is the minimum split size, numbers without
              multipliers default to megabytes.   For  example,  to  create  a
              split  archive called foo with the contents of the bar directory
              with splits of 670 MB that might be useful for burning  on  CDs,
              the command:

                     zip -s 670m -r foo bar

              could be used.

              Currently  the  old  splits  of a split archive are not excluded
              from a new archive, but they can be specifically  excluded.   If
              possible,  keep  the  input  and output archives out of the path
              being zipped when creating split archives.

              Using -s without -sp as above creates all the splits  where  foo
              is  being  written,  in  this  case the current directory.  This
              split mode updates the splits as the archive is  being  created,
              requiring  all  splits  to  remain  writable,  but creates split
              archives that are readable by  any  unzip  that  supports  split
              archives.   See  -sp  below  for enabling split pause mode which
              allows splits to be written directly to removable media.

              The option -sv can be used to enable verbose splitting and  pro-
              vide details of how the splitting is being done.  The -sb option
              can be used to ring the bell when zip pauses for the next  split
              destination.

              Split  archives cannot be updated, but see the -O (--out) option
              for how a split archive can be updated as it is copied to a  new
              archive.   A  split archive can also be converted into a single-
              file archive using a split size of 0 or negating the -s option:

                     zip -s 0 split.zip --out single.zip

              Also see -U (--copy) for more on using copy mode.

       -sb
       --split-bell
              If splitting and using split pause mode, ring the bell when  zip
              pauses for each split destination.

       -sc
       --show-command
              Show  the  command line starting zip as processed and exit.  The
              new command parser permutes the arguments, putting  all  options
              and  any values associated with them before any non-option argu-
              ments.  This allows an option to appear anywhere in the  command
              line  as  long as any values that go with the option go with it.
              This option displays the command line as zip sees it,  including
              any arguments from the environment such as from the ZIPOPT vari-
              able.  Where allowed, options later  in  the  command  line  can
              override options earlier in the command line.

       -sf
       --show-files
              Show  the  files  that  would  be  operated  on, then exit.  For
              instance, if creating a new archive, this will  list  the  files
              that  would  be  added.   If the option is negated, -sf-, output
              only to an open log file.  Screen display is not recommended for
              large lists.

       -so
       --show-options
              Show  all  available options supported by zip as compiled on the
              current system.  As this command  reads  the  option  table,  it
              should include all options.  Each line includes the short option
              (if defined), the long option (if defined), the  format  of  any
              value  that  goes with the option, if the option can be negated,
              and a small description.  The value  format  can  be  no  value,
              required  value,  optional value, single character value, number
              value, or a list of values.  The output of this  option  is  not
              intended  to  show  how  to  use  any  option but only show what
              options are available.

       -sp
       --split-pause
              If splitting is enabled with -s, enable split pause mode.   This
              creates split archives as -s does, but stream writing is used so
              each split can be closed as soon as it is written and  zip  will
              pause  between each split to allow changing split destination or
              media.

              Though this split mode allows writing splits directly to  remov-
              able  media, it uses stream archive format that may not be read-
              able by some unzips.  Before relying on splits created with -sp,
              test a split archive with the unzip you will be using.

              To  convert a stream split archive (created with -sp) to a stan-
              dard archive see the --out option.

       -su
       --show-unicode
              Similar to -sf, but also show Unicode version of the path if  it
              exists.

       -sU
       --show-just-unicode
              Similar  to  -sf, but show only the Unicode version of the path.
              If it doesn't exist, show the standard version of the path.

       -sv
       --split-verbose
              Enable various verbose messages while splitting, showing how the
              splitting is being done.

       -S
       --system-hidden
              [MSDOS,  OS/2, WIN32 and ATARI] Include system and hidden files.
              [MacOS] Includes  finder  invisible  files,  which  are  ignored
              otherwise.

       -t mmddyyyy
       --from-date mmddyyyy
              Do  not  operate  on files modified prior to the specified date,
              where mm is the month (00-12),  dd  is  the  day  of  the  month
              (01-31),  and  yyyy  is  the  year.   The  ISO 8601  date format
              yyyy-mm-dd is also accepted.  For example:

                     zip -rt 12071991 infamy foo

                     zip -rt 1991-12-07 infamy foo

              will add all the files in foo and its subdirectories  that  were
              last  modified  on  or after 7 December 1991, to the zip archive
              infamy.zip.

       -tt mmddyyyy
       --before-date mmddyyyy
              Do not operate on files modified after or at the specified date,
              where  mm  is  the  month  (00-12),  dd  is the day of the month
              (01-31), and  yyyy  is  the  year.   The  ISO 8601  date  format
              yyyy-mm-dd is also accepted.  For example:

                     zip -rtt 11301995 infamy foo

                     zip -rtt 1995-11-30 infamy foo

              will  add  all the files in foo and its subdirectories that were
              last modified before  30  November  1995,  to  the  zip  archive
              infamy.zip.

       -T
       --test
              Test  the integrity of the new zip file. If the check fails, the
              old zip file is unchanged and (with  the  -m  option)  no  input
              files  are  removed.   If  a  password  is provided to zip using
              options -e or -P, that password is now used  while  testing  the
              archive.

       -TT cmd
       --unzip-command cmd
              Use  command cmd instead of 'unzip -tqq' to test an archive when
              the -T option is used.  On Unix, to use a copy of unzip  in  the
              current  directory  instead  of  the  standard system unzip, one
              could use:

               zip archive file1 file2 -T -TT "./unzip -tqq"

              In cmd, {} is replaced by the name  of  the  temporary  archive,
              otherwise  the name of the archive is appended to the end of the
              command.  If a password was provided to zip, the  first  {p}  in
              the  cmd string is replaced by the password.  The return code is
              checked for success (0 on Unix).

       -u
       --update
              Replace (update) an existing entry in the zip archive only if it
              has  been modified more recently than the version already in the
              zip archive.  For example:

                     zip -u stuff *

              will add any new files in the current directory, and update  any
              files  which  have been modified since the zip archive stuff.zip
              was last created/modified (note that zip will not  try  to  pack
              stuff.zip into itself when you do this).

              Note  that  the -u option with no input file arguments acts like
              the -f (freshen) option.

       -U
       --copy-entries
              Copy entries from one archive to another.   Requires  the  --out
              option  to  specify  a  different  output  file  than  the input
              archive.  Copy mode is the reverse of -d delete.  When delete is
              being used with --out, the selected entries are deleted from the
              archive and all other entries are copied  to  the  new  archive,
              while copy mode selects the files to include in the new archive.
              Unlike -u update, input patterns on the command line are matched
              against archive entries only and not the file system files.  For
              instance,

                     zip inarchive "*.c" --copy --out outarchive

              copies entries with names ending in  .c  from  inarchive.zip  to
              outarchive.zip.  The wildcard must be escaped on some systems to
              prevent the shell from substituting names of files from the file
              system  which  may  have  no  relevance  to  the  entries in the
              archive.

              If no input files appear on the command line and --out is  used,
              copy mode is assumed:

                     zip inarchive --out outarchive

              This  is  useful for changing split size for instance (by adding
              the -s option).  It also will remove any data  descriptors  that
              are not needed.

              Encrypting  and  decrypting  entries  is not yet supported using
              copy mode.  Use zipcloak for that.

       -UN v
       --unicode v
              Determine what zip should do with Unicode file names.   zip 3.0,
              in  addition  to  the standard file path, now includes the UTF-8
              translation of the path if the entry path is not entirely  7-bit
              ASCII.   When  an entry is missing the Unicode path, zip reverts
              back to the standard file path.   The  problem  with  using  the
              standard  path is this path is in the local character set of the
              zip that created the entry, which may  contain  characters  that
              are  not  valid  in  the  character set being used by the unzip.
              When zip is reading an archive, if an entry also has  a  Unicode
              path, zip now defaults to using the Unicode path to recreate the
              standard path using the current local character set.

              This option can be used to determine what  zip  should  do  with
              this  path  if  there  is a mismatch between the stored standard
              path and the stored UTF-8 path (which can happen if the standard
              path  was  updated).  In all cases, if there is a mismatch it is
              assumed that the standard path is  more  current  and  zip  uses
              that.  Values for v are

                     q - quit if paths do not match

                     w - warn, continue with standard path

                     i - ignore, continue with standard path

                     n - no Unicode, do not use Unicode paths

              The default is to warn and continue.

              Characters  that  are not valid in the current character set are
              escaped as #Uxxxx and #Lxxxxxx, where x is  an  ASCII  character
              for a hex digit.  The first is used if a 16-bit character number
              is sufficient to represent the Unicode character and the  second
              if  the  character needs more than 16 bits to represent its Uni-
              code character code.  Setting -UN to

                     e - escape

              as in

                     zip archive -sU -UN=e

              forces zip to escape all characters that are not printable 7-bit
              ASCII.

              Normally zip stores UTF-8 directly in the standard path field on
              systems where UTF-8 is the current character set and stores  the
              UTF-8 in the new extra fields otherwise.  The option

                     u - UTF-8

              as in

                     zip archive dir -r -UN=UTF8

              forces  zip  to store UTF-8 as native in the archive.  Note that
              storing UTF-8 directly is the default on Unix systems that  sup-
              port  it.   This option could be useful on Windows systems where
              the escaped path is too large to be a valid path and  the  UTF-8
              version of the path is smaller, but native UTF-8 is not backward
              compatible on Windows systems.

       -v
       --verbose
              Verbose mode or print diagnostic version info.

              Normally, when applied to real operations, this  option  enables
              the  display of a progress indicator during compression (see -dd
              for more on dots) and requests  verbose  diagnostic  info  about
              zipfile structure oddities.

              However,  when -v is the only command line argument a diagnostic
              screen is printed instead.  This should now work even if  stdout
              is redirected to a file, allowing easy saving of the information
              for sending with bug reports to Info-ZIP.   The  version  screen
              provides  the help screen header with program name, version, and
              release date, some pointers to the Info-ZIP home  and  distribu-
              tion  sites,  and shows information about the target environment
              (compiler type and version, OS version, compilation date and the
              enabled optional features used to create the zip executable).

       -V
       --VMS-portable
              [VMS]  Save VMS file attributes.  (Files are  truncated at EOF.)
              When a -V archive is unpacked on a non-VMS  system,   some  file
              types  (notably  Stream_LF  text  files   and  pure binary files
              like fixed-512) should be extracted intact.  Indexed  files  and
              file  types  with embedded record sizes (notably variable-length
              record types) will probably be seen as corrupt elsewhere.

       -VV
       --VMS-specific
              [VMS] Save VMS file attributes, and  all allocated blocks  in  a
              file,   including  any  data beyond EOF.  Useful for moving ill-
              formed files  among   VMS  systems.    When  a  -VV  archive  is
              unpacked  on a non-VMS system, almost all files will appear cor-
              rupt.

       -w
       --VMS-versions
              [VMS] Include file version numbers in  the  archive  names.   By
              default,  version  numbers  are stripped from the archive names.
              That is, "[.d]a.b;3" is normally archived as "d/a.b",  but  with
              -w,  it would be archived as "d/a.b;3".  (This might be inconve-
              nient on a non-VMS system.  See also -ww, below.)

              Note that zip normally processes only the highest version  of  a
              file  (";0"),  but  an explicit version wildcard (like ";*") can
              override this.  -w is required if multiple versions  of  a  file
              are to be stored in an archive, otherwise, when the version num-
              bers are stripped off as the files are stored  in  the  archive,
              the  duplicate  names  would cause a "cannot repeat names in zip
              file" error.

       -ww
       --VMS-dot-versions
              [VMS] Like -w, except that version numbers in archive names  use
              a  "."  separator instead of the default ";".  That is, with -w,
              "[.d]a.b;3" would be archived as "d/a.b;3",  but  with  -ww,  it
              would  be  archived  as "d/a.b.3".  (This might be less inconve-
              nient on a non-VMS system.)

       -ws
       --wild-stop-dirs
              Wildcards match only at a directory level.  Normally zip handles
              paths as strings and given the paths

                     /foo/bar/dir/file1.c

                     /foo/bar/file2.c

              an input pattern such as

                     /foo/bar/*

              normally  would match both paths, the * matching dir/file1.c and
              file2.c.  Note that in the first case a directory  boundary  (/)
              was  crossed in the match.  With -ws no directory bounds will be
              included in the match, making  wildcards  local  to  a  specific
              directory  level.   So,  with  -ws enabled, only the second path
              would be matched.

              When using -ws, use ** to match across directory boundaries as *
              does normally.

       -x files
       --exclude files
              Explicitly exclude the specified files, as in:

                     zip -r foo foo -x \*.o

              which  will include the contents of foo in foo.zip while exclud-
              ing all the files that end in  .o.   The  backslash  avoids  the
              shell  filename  substitution, so that the name matching is per-
              formed by zip at all directory levels.

              Also possible:

                     zip -r foo foo -x@exclude.lst

              which will include the contents of foo in foo.zip while  exclud-
              ing   all  the  files  that  match  the  patterns  in  the  file
              exclude.lst.

              The long option forms of the above are

                     zip -r foo foo --exclude \*.o

              and

                     zip -r foo foo --exclude @exclude.lst

              Multiple patterns can be specified, as in:

                     zip -r foo foo -x \*.o \*.c

              If there is no space between -x and the pattern, just one  value
              is assumed (no list):

                     zip -r foo foo -x\*.o

              See -i for more on include and exclude.

       -X
       --no-extra
              Do  not save extra file attributes (Extended Attributes on OS/2,
              uid/gid and file times on Unix).   The  zip  format  uses  extra
              fields  to  include additional information for each entry.  Some
              extra fields are specific to particular systems while others are
              applicable to all systems.  Normally when zip reads entries from
              an existing archive, it reads the extra fields it knows,  strips
              the  rest,  and adds the extra fields applicable to that system.
              With -X, zip strips all old fields and only includes the Unicode
              and  Zip64 extra fields (currently these two extra fields cannot
              be disabled).

              Negating this  option,  -X-,  includes  all  the  default  extra
              fields, but also copies over any unrecognized extra fields.

       -y
       --symlinks
              For  UNIX and VMS (V8.3 and later), store symbolic links as such
              in the zip archive, instead of compressing and storing the  file
              referred  to  by  the  link.   This can avoid multiple copies of
              files being included in the archive as zip recurses  the  direc-
              tory trees and accesses files directly and by links.

       -z
       --archive-comment
              Prompt for a multi-line comment for the entire zip archive.  The
              comment is ended by a line containing just a period, or  an  end
              of file condition (^D on Unix, ^Z on MSDOS, OS/2, and VMS).  The
              comment can be taken from a file:

                     zip -z foo < foowhat

       -Z cm
       --compression-method cm
              Set the default compression method.  Currently the main  methods
              supported  by zip are store and deflate.  Compression method can
              be set to:

              store - Setting the compression method to store  forces  zip  to
              store  entries  with  no  compression.  This is generally faster
              than compressing entries, but results in no space savings.  This
              is the same as using -0 (compression level zero).

              deflate - This is the default method for zip.  If zip determines
              that storing is better than deflation, the entry will be  stored
              instead.

              bzip2 - If bzip2 support is compiled in, this compression method
              also becomes available.  Only some modern unzips currently  sup-
              port the bzip2 compression method, so test the unzip you will be
              using before relying on archives using this method  (compression
              method 12).

              For  example,  to  add bar.c to archive foo using bzip2 compres-
              sion:

                     zip -Z bzip2 foo bar.c

              The compression method can be abbreviated:

                     zip -Zb foo bar.c

       -#
       (-0, -1, -2, -3, -4, -5, -6, -7, -8, -9)
              Regulate the speed of compression using the specified  digit  #,
              where  -0  indicates  no compression (store all files), -1 indi-
              cates the fastest compression speed (less  compression)  and  -9
              indicates  the  slowest  compression speed (optimal compression,
              ignores the suffix list). The default compression level is -6.

              Though still being worked, the intention is  this  setting  will
              control  compression  speed  for  all compression methods.  Cur-
              rently only deflation is controlled.

       -!
       --use-privileges
              [WIN32] Use privileges (if granted) to  obtain  all  aspects  of
              WinNT security.

       -@
       --names-stdin
              Take the list of input files from standard input. Only one file-
              name per line.

       -$
       --volume-label
              [MSDOS, OS/2, WIN32] Include the  volume  label  for  the  drive
              holding the first file to be compressed.  If you want to include
              only the volume label or to force  a  specific  drive,  use  the
              drive name as first file name, as in:

                     zip -$ foo a: c:bar

EXAMPLES
       The simplest example:

              zip stuff *

       creates the archive stuff.zip (assuming it does not exist) and puts all
       the files in the current directory in it, in compressed form (the  .zip
       suffix  is  added automatically, unless the archive name contains a dot
       already; this allows the explicit specification of other suffixes).

       Because of the way the shell on Unix does filename substitution,  files
       starting with "." are not included; to include these as well:

              zip stuff .* *

       Even  this  will not include any subdirectories from the current direc-
       tory.

       To zip up an entire directory, the command:

              zip -r foo foo

       creates the archive foo.zip, containing all the files  and  directories
       in the directory foo that is contained within the current directory.

       You  may  want  to  make  a zip archive that contains the files in foo,
       without recording the directory name, foo.  You can use the  -j  option
       to leave off the paths, as in:

              zip -j foo foo/*

       If  you are short on disk space, you might not have enough room to hold
       both the  original  directory  and  the  corresponding  compressed  zip
       archive.   In  this case, you can create the archive in steps using the
       -m option.  If foo contains the subdirectories tom,  dick,  and  harry,
       you can:

              zip -rm foo foo/tom
              zip -rm foo foo/dick
              zip -rm foo foo/harry

       where  the  first  command creates foo.zip, and the next two add to it.
       At the completion of each zip command,  the  last  created  archive  is
       deleted, making room for the next zip command to function.

       Use  -s  to set the split size and create a split archive.  The size is
       given as a number followed optionally by one of k (kB), m (MB), g (GB),
       or t (TB).  The command

              zip -s 2g -r split.zip foo

       creates a split archive of the directory foo with splits no bigger than
       2 GB each.  If foo contained 5 GB of contents  and  the  contents  were
       stored  in  the split archive without compression (to make this example
       simple), this would create three splits, split.z01 at  2 GB,  split.z02
       at 2 GB, and split.zip at a little over 1 GB.

       The  -sp option can be used to pause zip between splits to allow chang-
       ing removable media, for example, but read the descriptions  and  warn-
       ings for both -s and -sp below.

       Though  zip does not update split archives, zip provides the new option
       -O (--output-file) to allow split archives to be updated and saved in a
       new archive.  For example,

              zip inarchive.zip foo.c bar.c --out outarchive.zip

       reads  archive  inarchive.zip,  even if split, adds the files foo.c and
       bar.c, and writes the resulting archive to  outarchive.zip.   If  inar-
       chive.zip is split then outarchive.zip defaults to the same split size.
       Be aware that outarchive.zip and any split files that are created  with
       it  are always overwritten without warning.  This may be changed in the
       future.

PATTERN MATCHING
       This section applies only to Unix.  Watch this  space  for  details  on
       MSDOS  and  VMS  operation.  However, the special wildcard characters *
       and [] below apply to at least MSDOS also.

       The Unix shells (sh, csh, bash, and others) normally do  filename  sub-
       stitution (also called "globbing") on command arguments.  Generally the
       special characters are:

       ?      match any single character

       *      match any number of characters (including none)

       []     match any character in the range indicated within  the  brackets
              (example:  [a-f], [0-9]).  This form of wildcard matching allows
              a user to specify a list of characters between  square  brackets
              and  if any of the characters match the expression matches.  For
              example:

                     zip archive "*.[hc]"

              would archive all files in the current directory that end in  .h
              or .c.

              Ranges of characters are supported:

                     zip archive "[a-f]*"

              would  add  to  the  archive all files starting with "a" through
              "f".

              Negation is also supported, where any character in that position
              not in the list matches.  Negation is supported by adding ! or ^
              to the beginning of the list:

                     zip archive "*.[!o]"

              matches files that don't end in ".o".

              On WIN32, [] matching needs to be turned on with the -RE  option
              to avoid the confusion that names with [ or ] have caused.

       When  these  characters  are  encountered (without being escaped with a
       backslash or quotes), the shell will look for  files  relative  to  the
       current  path  that  match the pattern, and replace the argument with a
       list of the names that matched.

       The zip program can do the same matching on names that are in  the  zip
       archive  being  modified  or,  in  the  case  of the -x (exclude) or -i
       (include) options, on the list of files to be  operated  on,  by  using
       backslashes  or  quotes to tell the shell not to do the name expansion.
       In general, when zip encounters a name in the list of files to  do,  it
       first  looks  for the name in the file system.  If it finds it, it then
       adds it to the list of files to do.  If it does not find it,  it  looks
       for  the  name  in the zip archive being modified (if it exists), using
       the pattern matching characters described above, if present.  For  each
       match,  it  will  add  that  name to the list of files to be processed,
       unless this name matches one given with the  -x  option,  or  does  not
       match any name given with the -i option.

       The pattern matching includes the path, and so patterns like \*.o match
       names that end in ".o", no matter what the path prefix is.   Note  that
       the  backslash must precede every special character (i.e. ?*[]), or the
       entire argument must be enclosed in double quotes ("").  (Some  systems
       also  permit  quoting  using single quotes ('') as well as quoting just
       the special characters, as in foo"*"bar.c, which matches all paths that
       start with "foo" and end with "bar.c".)

       In  general, use backslashes or double quotes for paths that have wild-
       cards to make zip do the pattern matching for file  paths,  and  always
       for paths and strings that have spaces or wildcards for -i, -x, -R, -d,
       and -U and anywhere zip needs to process the wildcards.

ENVIRONMENT
       The following environment  variables  are  read  and  used  by  zip  as
       described.

       ZIPOPT
              contains  default  options  that  will be used when running zip.
              The contents of this environment variable will get added to  the
              command line just after the zip command.

       ZIP
              [Not on RISC OS and VMS] see ZIPOPT

       Zip$Options
              [RISC OS] see ZIPOPT

       Zip$Exts
              [RISC  OS]  contains extensions separated by a : that will cause
              native filenames with one of  the  specified  extensions  to  be
              added to the zip file with basename and extension swapped.

       ZIP_OPTS
              [VMS] see ZIPOPT

SEE ALSO
       bzip2(1L), compress(1), gzip(1L), shar(1L), tar(1), unzip(1L)

DIAGNOSTICS
       The exit status (or error level) approximates the exit codes defined by
       PKWARE and takes on the following values, except under VMS:

              0      normal; no errors or warnings detected.

              2      unexpected end of zip file.

              3      a generic error in the zipfile format was detected.  Pro-
                     cessing may have completed successfully anyway; some bro-
                     ken zipfiles created by other archivers have simple work-
                     arounds.

              4      zip was unable to allocate memory for one or more buffers
                     during program initialization.

              5      a severe error in the zipfile format was detected.   Pro-
                     cessing probably failed immediately.

              6      entry  too  large  to  be  processed (such as input files
                     larger than 2 GB when not using Zip64 or trying  to  read
                     an existing archive that is too large) or entry too large
                     to be split with zipsplit

              7      invalid comment format

              8      zip -T failed or out of memory

              9      the user aborted zip prematurely with control-C (or simi-
                     lar)

              10     zip encountered an error while using a temp file

              11     read or seek error

              12     zip has nothing to do

              13     missing or empty zip file

              14     error writing to a file

              15     zip was unable to create a file to write to

              16     bad command line parameters

              18     zip could not open a specified file to read

              19     zip  was compiled with options not supported on this sys-
                     tem

       VMS interprets standard Unix (or PC) return values as  other,  scarier-
       looking  things,  so zip instead maps them into VMS-style status codes.
       In general, zip sets VMS Facility = 1955 (0x07A3), Code = 2*  Unix_sta-
       tus,  and  an  appropriate  Severity  (as specified in ziperr.h).  More
       details  are  included  in   the   VMS-specific   documentation.    See
       [.vms]NOTES.TXT and [.vms]vms_msg_gen.c.

BUGS
       zip  3.0 and later are not compatible with PKUNZIP 1.10. Use zip 1.1 to
       produce zip files which can be extracted by PKUNZIP 1.10.

       zip files produced by zip 3.0 and later must not be updated by zip  1.1
       or  PKZIP  1.10, if they contain encrypted members or if they have been
       produced in a pipe or on a non-seekable device. The old versions of zip
       or  PKZIP  would  create  an archive with an incorrect format.  The old
       versions can list the contents of the zip file but  cannot  extract  it
       anyway  (because  of the new compression algorithm).  If you do not use
       encryption and use regular disk files, you do not have  to  care  about
       this problem.

       On  VMS,  zip archives should have record format Stream_LF or Fixed-512
       (the usual Unix-like formats).  It may be possible to convert  archives
       with  other  formats using Rahul Dhesi's BILF program.  This version of
       zip handles some of the conversion internally.  When  using  Kermit  to
       transfer  zip  files  from  VMS to MSDOS, type "set file type block" on
       VMS.  When transfering from MSDOS to VMS, type "set file type fixed" on
       VMS.  In both cases, type "set file type binary" on MSDOS.

       On  some  older VMS versions, zip may hang for file specifications that
       use DECnet syntax foo::*.*.

       On OS/2, zip cannot match some names, such as those including an excla-
       mation  mark  or a hash sign.  This is a bug in OS/2 itself: the 32-bit
       DosFindFirst/Next don't find such names.  Other programs  such  as  GNU
       tar are also affected by this bug.

       Under  OS/2, the amount of Extended Attributes displayed by DIR is (for
       compatibility) the amount returned by the 16-bit version  of  DosQuery-
       PathInfo().  Otherwise OS/2 1.3 and 2.0 would report different EA sizes
       when DIRing a file.  However, the  structure  layout  returned  by  the
       32-bit  DosQueryPathInfo()  is  a  bit different, it uses extra padding
       bytes and link pointers (it's a linked list)  to  have  all  fields  on
       4-byte  boundaries for portability to future RISC OS/2 versions. There-
       fore the value reported by zip (which uses this 32-bit-mode size)  dif-
       fers  from  that  reported  by  DIR.   zip stores the 32-bit format for
       portability, even the 16-bit MS-C-compiled version running on OS/2 1.3,
       so even this one shows the 32-bit-mode size.

AUTHORS
       Copyright (C) 1997-2009 Info-ZIP.

       Currently distributed under the Info-ZIP license.

       Copyright (C) 1990-1997 Mark Adler, Richard B. Wales, Jean-loup Gailly,
       Onno van der Linden, Kai Uwe Rommel, Igor Mandrichenko, John  Bush  and
       Paul Kienitz.

       Original copyright:

       Permission is granted to any individual or institution to use, copy, or
       redistribute this software so long as all of  the  original  files  are
       included,  that  it  is  not  sold  for profit, and that this copyright
       notice is retained.

       LIKE ANYTHING ELSE THAT'S FREE, ZIP AND ITS  ASSOCIATED  UTILITIES  ARE
       PROVIDED  AS IS AND COME WITH NO WARRANTY OF ANY KIND, EITHER EXPRESSED
       OR IMPLIED. IN NO EVENT WILL THE COPYRIGHT HOLDERS BE  LIABLE  FOR  ANY
       DAMAGES RESULTING FROM THE USE OF THIS SOFTWARE.

       Please  send  bug reports and comments using the web page at: www.info-
       zip.org.  For bug reports, please  include  the  version  of  zip  (see
       zip -h),  the make options used to compile it (see zip -v), the machine
       and operating system in use, and as much additional information as pos-
       sible.

ACKNOWLEDGEMENTS
       Thanks  to  R. P. Byrne for his Shrink.Pas program, which inspired this
       project, and from which the shrink algorithm was stolen; to  Phil  Katz
       for  placing in the public domain the zip file format, compression for-
       mat, and .ZIP filename extension, and for accepting  minor  changes  to
       the  file  format; to Steve Burg for clarifications on the deflate for-
       mat; to Haruhiko Okumura and Leonid Broukhis for providing some  useful
       ideas  for  the  compression  algorithm; to Keith Petersen, Rich Wales,
       Hunter Goatley and Mark Adler for providing a mailing list and ftp site
       for  the  Info-ZIP  group to use; and most importantly, to the Info-ZIP
       group itself (listed in the file infozip.who)  without  whose  tireless
       testing  and bug-fixing efforts a portable zip would not have been pos-
       sible.  Finally we should thank (blame) the first  Info-ZIP  moderator,
       David  Kirschbaum,  for  getting  us into this mess in the first place.
       The manual page was rewritten for Unix by R. P. C. Rodgers and  updated
       by E. Gordon for zip 3.0.

Info-ZIP                      3 April 2009 (v3.1)                      ZIP(1L)
