egrep [options] [regexp] [files]

Searches one or more files for lines that match an extended regular expression regexp. egrep doesn't support the regular expressions \ (, \), \ n, \<, \>, \{, or \}, but does support the other expressions, as well as the extended set +, ?, |, and (). Remember to enclose these characters in quotes. Regular expressions are described in Chapter 6. Exit status is 0 if any lines match, 1 if none match, and 2 for errors.

See grep for the list of available options. Also see fgrep . egrep typically runs faster than those commands.


Search for occurrences of Victor or Victoria in file:

$ egrep 'Victor(ia)*'
$ egrep '(Victor|Victoria)'

Find and print strings such as old.doc1 or new.doc2 in files, and include their line numbers:

$ egrep -n '(old|new)\.doc?'

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