fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
127 lines
3.5 KiB
Groff
127 lines
3.5 KiB
Groff
.\" 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. 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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.\" $FreeBSD$
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.\"
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.Dd July 17, 2004
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.Dt LOOK 1
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.Os
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.Sh NAME
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.Nm look
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.Nd display lines beginning with a given string
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.Sh SYNOPSIS
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.Nm
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.Op Fl df
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.Op Fl t Ar termchar
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.Ar string
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.Op Ar
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.Sh DESCRIPTION
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The
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.Nm
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utility displays any lines in
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.Ar file
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which contain
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.Ar string
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as a prefix.
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As
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.Nm
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performs a binary search, the lines in
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.Ar file
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must be sorted.
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.Pp
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If
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.Ar file
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is not specified, the file
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.Pa /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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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl d , -alphanum
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Dictionary character set and order, i.e., only alphanumeric characters
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are compared.
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.It Fl f , -ignore-case
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Ignore the case of alphabetic characters.
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.It Fl t , -terminate Ar termchar
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Specify a string termination character, i.e., only the characters
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in
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.Ar string
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up to and including the first occurrence of
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.Ar termchar
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are compared.
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.El
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.Sh ENVIRONMENT
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The
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.Ev LANG , LC_ALL
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and
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.Ev LC_CTYPE
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environment variables affect the execution of the
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.Nm
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utility.
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Their effect is described in
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.Xr environ 7 .
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.Sh FILES
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.Bl -tag -width /usr/share/dict/words -compact
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.It Pa /usr/share/dict/words
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the dictionary
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.El
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.Sh EXIT STATUS
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The
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.Nm
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utility exits 0 if one or more lines were found and displayed,
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1 if no lines were found, and >1 if an error occurred.
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.Sh COMPATIBILITY
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The original manual page stated that tabs and blank characters participated
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in comparisons when the
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.Fl d
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option was specified.
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This was incorrect and the current man page matches the historic
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implementation.
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.Pp
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The
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.Fl a
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and
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.Fl -alternative
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flags are ignored for compatibility.
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.Sh SEE ALSO
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.Xr grep 1 ,
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.Xr sort 1
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.Sh HISTORY
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A
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.Nm
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utility appeared in
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.At v7 .
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.Sh BUGS
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Lines are not compared according to the current locale's collating
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order.
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Input files must be sorted with
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.Ev LC_COLLATE
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set to
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.Ql C .
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