Grep

grep (Global Regular Expression Print; g/re/p; global / regular expression / print) is a command line utility that for a given a list of files or standard input to read, grep searches for lines of text that match one or many regular expressions, and outputs only the matching lines.

See also

• agrep — approximate grep to facilitate fuzzy string searching
• fgrep — fixed pattern searches
• egrep — for searches involving more sophisticated regular expression syntax
• ngrep — network grep
• rgrep — recursive grep
• pgrep — displays the processes whose names match a regular expression
• ugrep — only do basic regexp string matching
• tcgrep — rewrite of grep which uses Perl regular expression syntax
• apachegrep — a Perl program to help webmasters go through their apache logs
• rexgrep — GUI frontend to grep
• webgrep — a set of 7 search utilities for web-masters

Other

• Structure grep (sgrep)
• Nondeterministic reverse grep (NR-grep)
• Grouse Grep (ggrep)
• Python Grep (pygrep)
• Multilingual Grep (lv)

External links

• GNU grep — the grep that usually comes with Linux distributions
• GNU grep man page
• The grep Command - by The Linux Information Project (LINFO)
• "The Treacherous Optimization" — article on tradeoffs in grep to favor best-case over worst-case scenarios
• Egrep for linguists — an introduction to egrep.
• Tony Abou-Assaleh's list of Greps
• TCGrep