/[pcre]/code/trunk/doc/pcregrep.1
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Load pcre-3.6 into code/trunk.
1 .TH PCREGREP 1
2 .SH NAME
3 pcregrep - a grep with Perl-compatible regular expressions.
4 .SH SYNOPSIS
5 .B pcregrep [-Vcfhilnrsvx] pattern [file] ...
6
7
8 .SH DESCRIPTION
9 \fBpcregrep\fR searches files for character patterns, in the same way as other
10 grep commands do, but it uses the PCRE regular expression library to support
11 patterns that are compatible with the regular expressions of Perl 5. See
12 \fBpcre(3)\fR for a full description of syntax and semantics.
13
14 If no files are specified, \fBpcregrep\fR reads the standard input. By default,
15 each line that matches the pattern is copied to the standard output, and if
16 there is more than one file, the file name is printed before each line of
17 output. However, there are options that can change how \fBpcregrep\fR behaves.
18
19 Lines are limited to BUFSIZ characters. BUFSIZ is defined in \fB<stdio.h>\fR.
20 The newline character is removed from the end of each line before it is matched
21 against the pattern.
22
23
24 .SH OPTIONS
25 .TP 10
26 \fB-V\fR
27 Write the version number of the PCRE library being used to the standard error
28 stream.
29 .TP
30 \fB-c\fR
31 Do not print individual lines; instead just print a count of the number of
32 lines that would otherwise have been printed. If several files are given, a
33 count is printed for each of them.
34 .TP
35
36 versity of Cambridge for use on Unix systems connected to
37 the Internet. It is freely available under the terms of
38 the GNU General Public Licence. In style it is similar to
39 Smail 3, but its facilities are more extensive, and in
40 particular it has some defences against mail bombs and
41 unsolicited junk mail, in the form of options for refusing
42 messages from particular hosts, networks, or senders.
43
44 Exim's command line takes the standard Unix form of a
45 sequence of options, each starting with a hyphen charac\fB-f\fIfilename\fR
46 Read patterns from the file, one per line, and match all patterns against each
47 line. There is a maximum of 100 patterns. Trailing white space is removed, and
48 blank lines are ignored. An empty file contains no patterns and therefore
49 matches nothing.
50 .TP
51 \fB-h\fR
52 Suppress printing of filenames when searching multiple files.
53 .TP
54 \fB-i\fR
55 Ignore upper/lower case distinctions during comparisons.
56 .TP
57 \fB-l\fR
58 Instead of printing lines from the files, just print the names of the files
59 containing lines that would have been printed. Each file name is printed
60 once, on a separate line.
61 .TP
62 \fB-n\fR
63 Precede each line by its line number in the file.
64 .TP
65 \fB-r\fR
66 If any file is a directory, recursively scan the files it contains. Without
67 \fB-r\fR a directory is scanned as a normal file.
68 .TP
69 \fB-s\fR
70 Work silently, that is, display nothing except error messages.
71 The exit status indicates whether any matches were found.
72 .TP
73 \fB-v\fR
74 Invert the sense of the match, so that lines which do \fInot\fR match the
75 pattern are now the ones that are found.
76 .TP
77 \fB-x\fR
78 Force the pattern to be anchored (it must start matching at the beginning of
79 the line) and in addition, require it to match the entire line. This is
80 equivalent to having ^ and $ characters at the start and end of each
81 alternative branch in the regular expression.
82
83
84 .SH SEE ALSO
85 \fBpcre(3)\fR, Perl 5 documentation
86
87
88 .SH DIAGNOSTICS
89 Exit status is 0 if any matches were found, 1 if no matches were found, and 2
90 for syntax errors or inacessible files (even if matches were found).
91
92
93 .SH AUTHOR
94 Philip Hazel <ph10@cam.ac.uk>
95
96 Last updated: 15 August 2001
97 .br
98 Copyright (c) 1997-2001 University of Cambridge.

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