124 lines
4.0 KiB
Groff
124 lines
4.0 KiB
Groff
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.\" Copyright (c) 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)look.1 8.1 (Berkeley) 6/14/93
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.\"
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.TH LOOK 1 "June 2011" "util-linux" "User Commands"
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.SH NAME
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look \- display lines beginning with a given string
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.SH SYNOPSIS
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.B look
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[options]
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.IR "string " [ file ]
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.SH DESCRIPTION
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The
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.B look
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utility displays any lines in
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.I file
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which contain
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.IR string .
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As
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.B look
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performs a binary search, the lines in
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.I file
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must be sorted (where
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.BR sort (1)
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was given the same options
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.BR "\-d " and/or " \-f " that
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.B look
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is invoked with).
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.PP
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If
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.I file
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is not specified, the file
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.I /usr/share/dict/words
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is used, only alphanumeric characters are compared and the case of
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alphabetic characters is ignored.
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.SH OPTIONS
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.TP
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.BR \-a , " \-\-alternative"
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Use the alternative dictionary file.
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.TP
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.BR \-d , " \-\-alphanum"
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Use normal dictionary character set and order, i.e. only blanks and
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alphanumeric characters are compared. This is on by default if no file is
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specified.
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Note that blanks have been added to dictionary character set for
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compatibility with \fBsort \-d\fR command since version 2.28.
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.TP
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.BR \-f , " \-\-ignore\-case"
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Ignore the case of alphabetic characters. This is on by default if no file is
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specified.
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.TP
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.BR \-t , " \-\-terminate " \fIcharacter\fR
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Specify a string termination character, i.e. only the characters
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in \fIstring\fR up to and including the first occurrence of \fIcharacter\fR
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are compared.
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.TP
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.BR \-V , " \-\-version"
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Display version information and exit.
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.TP
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.BR \-h , " \-\-help"
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Display help text and exit.
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.PP
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The
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.B look
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utility exits 0 if one or more lines were found and displayed, 1 if
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no lines were found, and >1 if an error occurred.
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.SH EXAMPLE
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.RS
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.nf
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sort -d /etc/passwd -o /tmp/look.dict
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look -t: root:foobar /tmp/look.dict
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.nf
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.RE
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.SH ENVIRONMENT
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.TP
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.B WORDLIST
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Path to a dictionary file. The environment variable has greater priority
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than the dictionary path defined in FILES segment.
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.SH FILES
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.IP "\fB/usr/share/dict/words\fR" 4
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the dictionary
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.IP "\fB/usr/share/dict/web2\fR" 4
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the alternative dictionary
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.SH "SEE ALSO"
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.BR grep (1),
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.BR sort (1)
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.SH HISTORY
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The
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.B look
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utility appeared in Version 7 AT&T Unix.
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.SH AVAILABILITY
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The look command is part of the util-linux package and is available from
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https://www.kernel.org/pub/linux/utils/util-linux/.
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