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Linux in a Nutshell, Fourth Edition by Aaron Weber, Stephen Figgins, Ellen Siever

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Name

egrep

Synopsis

                  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 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 9. 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)' 
                  file

Find 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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