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Contents of /code/tags/pcre-5.0/doc/pcregrep.1

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Tag code/trunk as code/tags/pcre-5.0.
3 pcregrep - a grep with Perl-compatible regular expressions.
5 .B pcregrep [-Vcfhilnrsuvx] [long options] [pattern] [file1 file2 ...]
6 .
8 .rs
9 .sp
10 \fBpcregrep\fP searches files for character patterns, in the same way as other
11 grep commands do, but it uses the PCRE regular expression library to support
12 patterns that are compatible with the regular expressions of Perl 5. See
13 .\" HREF
14 \fBpcrepattern\fP
15 .\"
16 for a full description of syntax and semantics of the regular expressions that
17 PCRE supports.
18 .P
19 A pattern must be specified on the command line unless the \fB-f\fP option is
20 used (see below).
21 .P
22 If no files are specified, \fBpcregrep\fP reads the standard input. By default,
23 each line that matches the pattern is copied to the standard output, and if
24 there is more than one file, the file name is printed before each line of
25 output. However, there are options that can change how \fBpcregrep\fP behaves.
26 .P
27 Lines are limited to BUFSIZ characters. BUFSIZ is defined in \fB<stdio.h>\fP.
28 The newline character is removed from the end of each line before it is matched
29 against the pattern.
30 .
32 .rs
33 .sp
34 .TP 10
35 \fB-V\fP
36 Write the version number of the PCRE library being used to the standard error
37 stream.
38 .TP
39 \fB-c\fP
40 Do not print individual lines; instead just print a count of the number of
41 lines that would otherwise have been printed. If several files are given, a
42 count is printed for each of them.
43 .TP
44 \fB-f\fP\fIfilename\fP
45 Read a number of patterns from the file, one per line, and match all of them
46 against each line of input. A line is output if any of the patterns match it.
47 When \fB-f\fP is used, no pattern is taken from the command line; all arguments
48 are treated as file names. There is a maximum of 100 patterns. Trailing white
49 space is removed, and blank lines are ignored. An empty file contains no
50 patterns and therefore matches nothing.
51 .TP
52 \fB-h\fP
53 Suppress printing of filenames when searching multiple files.
54 .TP
55 \fB-i\fP
56 Ignore upper/lower case distinctions during comparisons.
57 .TP
58 \fB-l\fP
59 Instead of printing lines from the files, just print the names of the files
60 containing lines that would have been printed. Each file name is printed
61 once, on a separate line.
62 .TP
63 \fB-n\fP
64 Precede each line by its line number in the file.
65 .TP
66 \fB-r\fP
67 If any file is a directory, recursively scan the files it contains. Without
68 \fB-r\fP a directory is scanned as a normal file.
69 .TP
70 \fB-s\fP
71 Work silently, that is, display nothing except error messages.
72 The exit status indicates whether any matches were found.
73 .TP
74 \fB-u\fP
75 Operate in UTF-8 mode. This option is available only if PCRE has been compiled
76 with UTF-8 support. Both the pattern and each subject line must be valid
77 strings of UTF-8 characters.
78 .TP
79 \fB-v\fP
80 Invert the sense of the match, so that lines which do \fInot\fP match the
81 pattern are now the ones that are found.
82 .TP
83 \fB-x\fP
84 Force the pattern to be anchored (it must start matching at the beginning of
85 the line) and in addition, require it to match the entire line. This is
86 equivalent to having ^ and $ characters at the start and end of each
87 alternative branch in the regular expression.
88 .
90 .rs
91 .sp
92 Long forms of all the options are available, as in GNU grep. They are shown in
93 the following table:
94 .sp
95 -c --count
96 -h --no-filename
97 -i --ignore-case
98 -l --files-with-matches
99 -n --line-number
100 -r --recursive
101 -s --no-messages
102 -u --utf-8
103 -V --version
104 -v --invert-match
105 -x --line-regex
106 -x --line-regexp
107 .sp
108 In addition, --file=\fIfilename\fP is equivalent to -f\fIfilename\fP, and
109 --help shows the list of options and then exits.
110 .
112 .rs
113 .sp
114 Exit status is 0 if any matches were found, 1 if no matches were found, and 2
115 for syntax errors or inacessible files (even if matches were found).
116 .
117 .
119 .rs
120 .sp
121 Philip Hazel <ph10@cam.ac.uk>
122 .br
123 University Computing Service
124 .br
125 Cambridge CB2 3QG, England.
126 .P
127 .in 0
128 Last updated: 09 September 2004
129 .br
130 Copyright (c) 1997-2004 University of Cambridge.

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