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Multiple search strings, multiple filename patterns Locate -i calendar | grep Users | egrep -vi 'twiki|gif|shtml|drupal-7|java|PNG' # oh yeah Ls -al | grep '^d' # list all dirs in the current dirĮgrep 'apple|banana|orange' * # search for multiple patterns, all files in current dirĮgrep -i 'apple|banana|orange' * # same thing, case-insensitiveĮgrep 'score|nation|liberty|equal' gettysburg-address.txt # all lines matching multiple patterns Ps auxwww | grep -i java # all processes containing 'java', ignoring case Ps auxwww | grep httpd # all processes containing 'httpd' Grep -vi fred /etc/passwd # same thing, case-insensitive Grep -v fred /etc/passwd # find any line *not* containing 'fred' Grep -B5 -A5 "the living" gettysburg-address.txt # five lines before and ten lines after

Grep -A10 "the living" gettysburg-address.txt # show all matches, and ten lines after each match Grep -B5 "the living" gettysburg-address.txt # show all matches, and five lines before each match Grep -n we gettysburg-address.txt # show line numbers as well as the matching lines Grep -il StartInterval *.plist # same thing, case-insensitive Grep -l StartInterval *.plist # show all filenames containing the string 'StartInterval'

Grep '' * # find all lines in all files in the current dir with three numbers in a row Grep 'oo' * # find Foo or Goo in all files in the current dir Grep '^fred' /etc/passwd # find 'fred', but only at the start of a line Grep -i joe users.txt # find joe, Joe, JOe, JOE, etc. Grep null *.scala # search multiple files Grep fred /etc/passwd # quotes usually not when you don't use regex patterns Grep 'fred' /etc/passwd # search for lines containing 'fred' in /etc/passwd (If the Table of Contents over there on the right side is still in the way, click or tap the ‘hide’ link in its title to hide it): Abridged grep command examplesįirst up, if you don’t like reading a bunch of text and just want to see a collection of grep commands, this section is for you. I think it’s easiest to learn how to use the grep command by showing examples, so let’s dive right in.

The name grep means "general regular expression parser", but you can think of the grep command as a “search” command for Unix and Linux systems: It’s used to search for text strings and regular expressions within one or more files. Linux grep FAQ: Can you share some Linux/Unix grep command examples?