egrep
egrep [options] [regexp] [files]Search one or more files for lines that match an extended regular expression regexp. egrep doesn't support the regular expressions \(, \), \n, \<, \>, \{, or \}, but it 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 7. 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.
Examples
Search for occurrences of Victor or Victoria in file:egrep 'Victor(ia)*' file egrep '(Victor|Victoria)' fileFind and print strings such as old.doc1 or new.doc2 in files, and include their line numbers:
egrep -n '(old|new)\.doc?' files
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