| grep |
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|
grep [ options ... ] pattern-spec [ files ... ] |
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|
| To print lines of text that match one or more patterns. This is often the first stage in a pipeline that does further processing on matched data. |
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|
| -E |
Match using extended regular expressions. grep -E
replaces the
traditional egrep command.
| -F
|
Match using fixed strings. grep -F replaces the
traditional fgrep command.
| |
Usually, the first nonoption argument specifies the
pattern(s) to match.
Multiple patterns can be supplied by quoting them and
separating them with
newlines. In the case that the pattern starts with a
minus sign, grep could
get confused and treat it as an option. The -e option
specifies that its
argument is a pattern, even if it starts with a minus
sign.
| -f pat-file
|
Read patterns from the file pat-file.
| -i
|
Ignore lettercase when doing pattern matching.
| -l
|
List the names of files that match the pattern instead
of printing the
matching lines.
| -q
|
Be quiet. Instead of writing lines to standard output,
grep exits
successfully if it matches the pattern, unsuccessfully
otherwise. (We haven't
discussed success/nonsuccess yet; see Section 6.2.)
| -s
|
Suppress error messages. This is often used together
with -q.
| -v
|
Print lines that don't match the pattern.
| |
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|
| Read through each file named on the command line. When a line matches the pattern being searched for, print the line. When multiple files are named, grep precedes each line with the filename and a colon. The default is to use BREs. |
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|
| You can use multiple -e and -f options to build up a list of patterns to search for. |
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