ea17ba8289
gentoo has "util-linux 2.24.1" with long options. Other distributions have similar. usage() is intentionally unchanged to keep it short and sweet Reviewed by: jmg Discussed with: adrian, jilles
127 lines
3.5 KiB
Groff
127 lines
3.5 KiB
Groff
.\" Copyright (c) 1990, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)look.1 8.1 (Berkeley) 6/14/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd July 17, 2004
|
|
.Dt LOOK 1
|
|
.Os
|
|
.Sh NAME
|
|
.Nm look
|
|
.Nd display lines beginning with a given string
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl df
|
|
.Op Fl t Ar termchar
|
|
.Ar string
|
|
.Op Ar
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
utility displays any lines in
|
|
.Ar file
|
|
which contain
|
|
.Ar string
|
|
as a prefix.
|
|
As
|
|
.Nm
|
|
performs a binary search, the lines in
|
|
.Ar file
|
|
must be sorted.
|
|
.Pp
|
|
If
|
|
.Ar file
|
|
is not specified, the file
|
|
.Pa /usr/share/dict/words
|
|
is used, only alphanumeric characters are compared and the case of
|
|
alphabetic characters is ignored.
|
|
.Pp
|
|
The following options are available:
|
|
.Bl -tag -width indent
|
|
.It Fl d , -alphanum
|
|
Dictionary character set and order, i.e., only alphanumeric characters
|
|
are compared.
|
|
.It Fl f , -ignore-case
|
|
Ignore the case of alphabetic characters.
|
|
.It Fl t , -terminate Ar termchar
|
|
Specify a string termination character, i.e., only the characters
|
|
in
|
|
.Ar string
|
|
up to and including the first occurrence of
|
|
.Ar termchar
|
|
are compared.
|
|
.El
|
|
.Sh ENVIRONMENT
|
|
The
|
|
.Ev LANG , LC_ALL
|
|
and
|
|
.Ev LC_CTYPE
|
|
environment variables affect the execution of the
|
|
.Nm
|
|
utility.
|
|
Their effect is described in
|
|
.Xr environ 7 .
|
|
.Sh FILES
|
|
.Bl -tag -width /usr/share/dict/words -compact
|
|
.It Pa /usr/share/dict/words
|
|
the dictionary
|
|
.El
|
|
.Sh EXIT STATUS
|
|
The
|
|
.Nm
|
|
utility exits 0 if one or more lines were found and displayed,
|
|
1 if no lines were found, and >1 if an error occurred.
|
|
.Sh COMPATIBILITY
|
|
The original manual page stated that tabs and blank characters participated
|
|
in comparisons when the
|
|
.Fl d
|
|
option was specified.
|
|
This was incorrect and the current man page matches the historic
|
|
implementation.
|
|
.Pp
|
|
The
|
|
.Fl a
|
|
and
|
|
.Fl -alternative
|
|
flags are ignored for compability.
|
|
.Sh SEE ALSO
|
|
.Xr grep 1 ,
|
|
.Xr sort 1
|
|
.Sh HISTORY
|
|
A
|
|
.Nm
|
|
utility appeared in
|
|
.At v7 .
|
|
.Sh BUGS
|
|
Lines are not compared according to the current locale's collating
|
|
order.
|
|
Input files must be sorted with
|
|
.Ev LC_COLLATE
|
|
set to
|
|
.Ql C .
|