Difference between revisions of "Grep"
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Revision as of 15:35, 5 January 2019
grep searches the named input FILEs (or standard input if no files are named, or if a single hyphen-minus (-) is given as file name) for lines containing a match to the given PATTERN. By default, grep prints the matching lines. grep is a powerful tool.
Using grep
Recursively search DIR for "STRING" (also ignores caps)
grep -ri "STRING" /DIR/
Piping
grep can also be piped from or to other outputs using the pipe "|"
grep "STRING" /LOCATION/logfile.log |grep ANOTHERSTRING
Example usage:
grep "13:00:" /var/log/messages |grep "September"
tail -f /var/log/somefile.log |grep specificstring
