Grep: Difference between revisions
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:Find lines matching pattern in any of the files. | :Find lines matching pattern in any of the files. | ||
:When multiple files are scanned the filename is reported too (see -h below) | :When multiple files are scanned the filename is reported too (see -h below) | ||
;zgrep <pattern> <files> | |||
:Search possibly gzipped files. | |||
=Useful options= | =Useful options= | ||
| Line 12: | Line 15: | ||
;-l | ;-l | ||
:Only report filename of files with matches | :Only report filename of files with matches | ||
;-h | ;-H -h | ||
: | :Force or suppress reporting of filenames. | ||
;-n | ;-n | ||
:Report linenumber of matches too | :Report linenumber of matches too | ||
;-f <file> | ;-f <file> | ||
:Get patterns from <file>. One(1) pattern per line. | :Get patterns from <file>. One(1) pattern per line. | ||
;-C 2 | |||
:Print the context meaning 2 line before and after the matching line. | |||
=Return value ( $? )= | =Return value ( $? )= | ||
Latest revision as of 09:55, 3 September 2024
Find pattern in data stream (files, standard input)
- grep <pattern> <files>
- Find lines matching pattern in any of the files.
- When multiple files are scanned the filename is reported too (see -h below)
- zgrep <pattern> <files>
- Search possibly gzipped files.
Useful options
- -i
- Ignore case
- -v
- Negate the match, show all lines not having the pattern
- -l
- Only report filename of files with matches
- -H -h
- Force or suppress reporting of filenames.
- -n
- Report linenumber of matches too
- -f <file>
- Get patterns from <file>. One(1) pattern per line.
- -C 2
- Print the context meaning 2 line before and after the matching line.
Return value ( $? )
0 (true) if one or more matches are found
1 (false) if no matches are found