DU(1)

NAME
du - estimate file space usage

SYNOPSIS
du [options] [file...]

POSIX options: [-askx]

GNU options (shortest form): [-abchklmsxDLS] [--help] [--version] [--]

DESCRIPTION
du reports the amount of disk space used by the specified files, and by each directory in the hierarchies rooted at the specified files. Here `disk space used' means space used for the entire file hierarchy below the specified file.

With no arguments, du reports the disk space for the current directory.

POSIX DETAILS
The output is in 512-byte units by default, but in 1024-byte units when the -k option is given.

GNU DETAILS
The output is in 1024-byte units (when no units are specified by options), unless the environment variable POSIXLY_CORRECT is set, in which case POSIX is followed.

POSIX OPTIONS

-a  Show counts for all files encountered, not just directories.

-k  Use 1024-byte units instead of the default 512-byte units.

-s  Only output space usage for the actual arguments given, not for their subdirectories.

-x  Only count space on the same device as the argument given.

GNU OPTIONS

-a, --all
    Show counts for all files, not just directories.

-b, --bytes
    Print sizes in bytes, instead of kilobytes.

-c, --total
    Print a grand total of all arguments after all arguments have been processed. This can be used to find out the total disk usage of a given set of files or directories.

-D, --dereference-args
    Dereference symbolic links that are command line arguments. Does not affect other symbolic links. This is helpful for finding out the disk usage of directories, such as /usr/tmp, which are often symbolic links.

-h, --human-readable
    Append a size letter, such as M for megabytes, to each size.

-k, --kilobytes
    Print sizes in kilobytes.

-l, --count-links
    Count the size of all files, even if they have appeared already (as a hard link).

-L, --dereference
    Dereference symbolic links (show the disk space used by the file or directory that the link points to instead of the space used by the link).

-m, --megabytes
    Print sizes in megabyte (that 1,048,576 bytes) blocks.

-s, --summarize
    Display only a total for each argument.

-S, --separate-dirs
    Report the size of each directory separately, not including the sizes of subdirectories.

-x, --one-file-system
    Skip directories that are on different filesystems from the one that the argument being processed is on.

GNU STANDARD OPTIONS

--help
    Print a usage message on standard output and exit successfully.

--version
    Print version information on standard output, then exit successfully.

--  Terminate option list.

BUGS
On BSD systems, du reports sizes that are half the correct values for files that are NFS-mounted from HP-UX systems. On HP-UX systems, it reports sizes that are twice the correct values for files that are NFS-mounted from BSD systems. This is due to a flaw in HP-UX; it also affects the HP-UX du program.

ENVIRONMENT
The variable POSIXLY_CORRECT determines the choice of unit. If it is not set, and the variable BLOCKSIZE has a value starting with `HUMAN', then behaviour is as for the -h option, unless overridden by -k or -m options. The variables LANG, LC_ALL, LC_CTYPE and LC_MESSAGES have the usual meaning.

CONFORMING TO
POSIX 1003.2

NOTES
This page describes du as found in the fileutils-3.16 package; other versions may differ slightly. Mail corrections and additions to aeb@cwi.nl and aw@mail1.bet1.puv.fi and ragnar@lightside.ddns.org . Report bugs in the program to fileutils-bugs@gnu.ai.mit.edu.