Difference between revisions of "Grep"
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| Line 12: | Line 12: | ||
;-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 | ||
Revision as of 09:02, 7 September 2020
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 -h
- Force or suppress reporting of filenames.
- -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