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NAME
pcregrep - a grep with Perl-compatible regular expressions.
SYNOPSIS
pcregrep [-Vcfhilnrsuvx] [long options] [pattern] [file1
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 other-
wise 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 mul-
tiple files.
-i Ignore upper/lower case distinctions during com-
parisons.
-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 (c) 1997-2003 University of Cambridge.
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