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//po4a: entry man manual
////
Copyright (c) 1990, 1993
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@(#)look.1 8.1 (Berkeley) 6/14/93
////
= look(1)
:doctype: manpage
:man manual: User Commands
:man source: util-linux {release-version}
:page-layout: base
:command: look
== NAME
look - display lines beginning with a given string
== SYNOPSIS
*look* [options] _string_ [_file_]
== DESCRIPTION
The *look* utility displays any lines in _file_ which contain _string_ as a prefix. As *look* performs a binary search, the lines in _file_ must be sorted (where *sort*(1) was given the same options *-d* and/or *-f* that *look* is invoked with).
If _file_ is not specified, the file _/usr/share/dict/words_ is used, only alphanumeric characters are compared and the case of alphabetic characters is ignored.
== OPTIONS
*-a*, *--alternative*::
Use the alternative dictionary file.
*-d*, *--alphanum*::
Use normal dictionary character set and order, i.e., only blanks and alphanumeric characters are compared. This is on by default if no file is specified.
+
Note that blanks have been added to dictionary character set for compatibility with *sort -d* command since version 2.28.
*-f*, *--ignore-case*::
Ignore the case of alphabetic characters. This is on by default if no file is specified.
*-t*, *--terminate* _character_::
Specify a string termination character, i.e., only the characters in _string_ up to and including the first occurrence of _character_ are compared.
include::man-common/help-version.adoc[]
The *look* utility exits 0 if one or more lines were found and displayed, 1 if no lines were found, and >1 if an error occurred.
== ENVIRONMENT
*WORDLIST*::
Path to a dictionary file. The environment variable has greater priority than the dictionary path defined in the *FILES* segment.
== FILES
_/usr/share/dict/words_::
the dictionary
_/usr/share/dict/web2_::
the alternative dictionary
== HISTORY
The *look* utility appeared in Version 7 AT&T Unix.
== EXAMPLES
....
sort -d /etc/passwd -o /tmp/look.dict
look -t: root:foobar /tmp/look.dict
....
== SEE ALSO
*grep*(1),
*sort*(1)
include::man-common/bugreports.adoc[]
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