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tcgrep - search for regular expressions and print
tcgrep [ -[incCwsxvhlF1HurtpaqT] ] [ -e pattern ] [ -f pattern-file ] [ -P sep ] [ pattern ] [ files ... ]
tcgrep searches for lines (or, optionally, paragraphs) in files that satisfy the criteria specified by the user-supplied patterns. Because tcgrep is a Perl program, the user has full access to Perl's rich regular expression engine. See perlre.
The first argument after the options (assuming the user did not specify the -e option or the -f option) is taken as pattern. If the user does not supply a list of file or directory names to search, tcgrep will attempt to search its standard input.
With no arguments, tcgrep will output its option list and exit.
tcgrep accepts these options:
Allow at most one match per file.
Search all files. The default is to only search plain text files and compressed files.
Output the count of the matching lines or paragraphs. This is similar to the -c option (in fact, it implies the -c option), except more than one match is possible in each line or paragraph.
Output the count of the matching lines or paragraphs.
- -e pattern
Treat pattern as a pattern. This option is most useful when pattern starts with a
-and the user wants to avoid confusing the option parser.
The -f option supercedes the -e option.
fgrep mode. Disable regular expressions and perform Boyer-Moore searches. (Whether it lives up to the 'f' in fgrep is another issue).
- -f pattern-file
Treat pattern-file as a newline-separated list of patterns to use as search criteria.
the -f option supercedes the -e option.
Highlight matches. This option causes tcgrep to attempt to use your terminal's stand-out (emboldening) functionality to highlight those portions of each matching line or paragraph that actually triggered the match. This feature is very similar to the way the less(1) pager highlights matches. See also -u.
Hide filenames. Only print matching lines or paragraphs.
Ignore case while matching. This means, for example, that the pattern
unixas well as
UniX(plus the other fourteen possible capitalizations). This corresponds to the
/iPerl regular expression switch. See perlre.
List files containing matches. This option tells tcgrep not to print any matches but only the names of the files containing matches. This option implies the -1 option.
Number lines or paragraphs. Before outputting a given match, tcgrep will first output its line or paragraph number corresponding to the value of the Perl magic scalar $. (whose documentation is in perlvar).
- -P sep
Put tcgrep in paragraph mode, and use sep as the paragraph separator. This is implemented by assigning sep to Perl's magic $/ scalar. See perlvar.
Paragraph mode. This causes tcgrep to set Perl's magic $/ to
''. (Note that the default is to process files in line mode.) See perlvar.
Quiet mode. Suppress diagnostic messages to the standard error. See -s.
Recursively scan directories. This option causes tcgrep to descend directories in a left-first, depth-first manner and search for matches in the files of each directory it encounters. The presence of -r implies a file argument of ., the current directory, if the user does not provide filenames on the command line. See "EXAMPLES".
Silent mode. Do not write to the standard output. This option would be useful from a shell script, for example, if you are only interested in whether or not there exists a match for a pattern. See also -q.
Trace files as processed. This causes tcgrep to send diagnostic messages to the standard error when skipping symbolic links to directories, when skipping directories because the user did not give the -r switch, when skipping non-plain files (see "-f" in perlfunc), when skipping non-text files (see "-T" in perlfunc), and when opening a file for searching
Process directories in
`ls -t`order. Search the files in each directory starting with the most recently modified and ending with the least recently modified.
Underline matches. This option causes tcgrep to attempt to use your terminal's underline functionality to underline those portions of each matching line or paragraph that actually triggered the match. See also -H.
Invert the sense of the match, i.e. print those lines or paragraphs that do not match. When using this option in conjunction with -f, keep in mind that the entire set of patterns are grouped together in one pattern for the purposes of negation. See "EXAMPLES".
Matches must start and end at word boundaries. This is currently implemented by surrounding each pattern with a pair of
\b, the Perl regular expression word boundary metasequence. See perlre for the precise definition of
Exact matches only. The pattern must match the entire line or paragraph.
The user's TCGREP environment variable is taken as the default set of options to tcgrep.
Search all files under /etc/init.d for a particular pattern:
% tcgrep -r tcgrep /etc/init.d
Use of -v and -f options in conjunction with one another:
% cat fruits pomme banane poire % cat pats pomme poire % tcgrep -vf pats fruits banane
Add more cool examples. :-)
Perhaps allow the user to provide an exclusion pattern for skipping over files whose names match the pattern.
tcgrep: tom christiansen's rewrite of grep v1.0: Thu Sep 30 16:24:43 MDT 1993 v1.1: Fri Oct 1 08:33:43 MDT 1993 Revision by Greg Bacon <email@example.com> Fixed up highlighting for those of us trapped in terminfo implemented -f v1.2: Fri Jul 26 13:37:02 CDT 1996 Revision by Greg Bacon <firstname.lastname@example.org> Avoid super-inefficient matching (almost twice as fast! :-) v1.3: Sat Aug 30 14:21:47 CDT 1997 Revision by Paul Grassie <email@example.com> Removed vestiges of Perl4, made strict v1.4: Mon May 18 16:17:48 EDT 1998 Revision by Greg Bacon <firstname.lastname@example.org> Add fgrep functionality for PPT v1.5: Mon Mar 8 12:05:29 CST 1999 Revision by Bill Benedetto <email@example.com> Added CLOSE after each file is done to reset counters v1.6: Sat Mar 20 23:05:35 1999 Revision by Paul Johnson <firstname.lastname@example.org> Add support for bzip2 and zip files File names are printed by default when using -r and supplying no directory v1.7: Thu May 27 00:25:30 BST 1999
tcgrep was written by Tom Christiansen with updates by Greg Bacon and Paul Grassie.
Copyright (c) 1993-1999. Tom Christiansen.
This program is free and open software. You may use, copy, modify, distribute, and sell this program (and any modified variants) in any way you wish, provided you do not restrict others from doing the same.