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UNIX in a Nutshell: System V Edition

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UNIX Commands
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egrep

egrep [options] [regexp] [files]

Search one or more files for lines that match a regular expression regexp. egrep doesn't support the metacharacters \(, \), \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 Section 6. Exit status is 0 if any lines match, 1 if not, and 2 for errors. See also grep and fgrep. egrep typically runs faster than those.

Options

-b

Precede each line with its block number.

-c

Print only a count of matched lines.

-e regexp

Use this if regexp begins with -.

-f file

Take expression from file.

-h

List matched lines but not filenames (inverse of -l).

-i

Ignore uppercase and lowercase distinctions.

-l

List filenames but not matched lines.

-n

Print lines and their line numbers.

-s

Silent mode: print only error messages, and return the exit status.

-v

Print all lines that don't match regexp.

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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