pcregrep specification

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- SYNOPSIS
- DESCRIPTION
- OPTIONS
- LONG OPTIONS
- DIAGNOSTICS
- AUTHOR

SYNOPSIS

pcregrep [-Vcfhilnrsuvx] [long options] [pattern] [file1 file2 ...]

DESCRIPTION

pcregrep searches files for character patterns, in the same way as other grep commands do, but it uses the PCRE regular expression library to support patterns that are compatible with the regular expressions of Perl 5. See pcrepattern for a full description of syntax and semantics of the regular expressions that PCRE supports.

A pattern must be specified on the command line unless the -f option is used (see below).

If no files are specified, pcregrep reads the standard input. By default, each line that matches the pattern is copied to the standard output, and if there is more than one file, the file name is printed before each line of output. However, there are options that can change how pcregrep behaves.

Lines are limited to BUFSIZ characters. BUFSIZ is defined in <stdio.h>. The newline character is removed from the end of each line before it is matched against the pattern.

OPTIONS

-V Write the version number of the PCRE library being used to the standard error stream.

-c Do not print individual lines; instead just print a count of the number of lines that would otherwise have been printed. If several files are given, a count is printed for each of them.

-ffilename Read a number of patterns from the file, one per line, and match all of them against each line of input. A line is output if any of the patterns match it. When -f is used, no pattern is taken from the command line; all arguments are treated as file names. There is a maximum of 100 patterns. Trailing white space is removed, and blank lines are ignored. An empty file contains no patterns and therefore matches nothing.

-h Suppress printing of filenames when searching multiple files.

-i Ignore upper/lower case distinctions during comparisons.

-l Instead of printing lines from the files, just print the names of the files containing lines that would have been printed. Each file name is printed once, on a separate line.

-n Precede each line by its line number in the file.

-r If any file is a directory, recursively scan the files it contains. Without -r a directory is scanned as a normal file.

-s Work silently, that is, display nothing except error messages. The exit status indicates whether any matches were found.

-u Operate in UTF-8 mode. This option is available only if PCRE has been compiled with UTF-8 support. Both the pattern and each subject line are assumed to be valid strings of UTF-8 characters.

-v Invert the sense of the match, so that lines which do not match the pattern are now the ones that are found.

-x Force the pattern to be anchored (it must start matching at the beginning of the line) and in addition, require it to match the entire line. This is equivalent to having ^ and $ characters at the start and end of each alternative branch in the regular expression.

LONG OPTIONS

Long forms of all the options are available, as in GNU grep. They are shown in the following table:

      -c   --count
      -h   --no-filename
      -i   --ignore-case
      -l   --files-with-matches
      -n   --line-number
      -r   --recursive
      -s   --no-messages
      -u   --utf-8
      -V   --version
      -v   --invert-match
      -x   --line-regex
      -x   --line-regexp

In addition, --file=filename is equivalent to -ffilename, and --help shows the list of options and then exits.

DIAGNOSTICS

Exit status is 0 if any matches were found, 1 if no matches were found, and 2 for syntax errors or inacessible files (even if matches were found).

AUTHOR

Philip Hazel <ph10@cam.ac.uk>
University Computing Service
Cambridge CB2 3QG, England.

Last updated: 03 February 2003
Copyright © 1997-2003 University of Cambridge.