Grep: Difference between revisions
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;grep <pattern> <files> | ;grep <pattern> <files> | ||
:Find 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) | ||
=Useful options= | |||
;-i | ;-i | ||
:Ignore case | :Ignore case | ||
;-v | |||
:Negate the match, show all lines not having the pattern | |||
;-l | ;-l | ||
:Only report filename of files with matches | :Only report filename of files with matches | ||
| Line 16: | Line 18: | ||
;-f <file> | ;-f <file> | ||
:Get patterns from <file>. One(1) pattern per line. | :Get patterns from <file>. One(1) pattern per line. | ||
=Return value ( $? )= | |||
0 (true) if one or more matches are found | |||
1 (false) if no matches are found | |||
Revision as of 19:58, 21 November 2018
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)
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
- Suppress reporting of filenames when multiple files are scanned.
- -n
- Report linenumber of matches too
- -f <file>
- Get patterns from <file>. One(1) pattern per line.
Return value ( $? )
0 (true) if one or more matches are found
1 (false) if no matches are found