.\"	$OpenBSD: look.1,v 1.8 2000/03/10 19:07:20 aaron Exp $
.\"	$NetBSD: look.1,v 1.3 1994/12/23 01:10:59 jtc Exp $
.\"
.\" 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:
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.\" 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.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 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.
.\"
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.\"     @(#)look.1	8.1 (Berkeley) 6/14/93
.\"
.Dd June 14, 1993
.Dt LOOK 1
.Os
.Sh NAME
.Nm look
.Nd display lines beginning with a given string
.Sh SYNOPSIS
.Nm look
.Op Fl df
.Op Fl t Ar termchar
.Ar string
.Op Ar file
.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 options are as follows:
.Bl -tag -width Ds
.It Fl d
Dictionary character set and order, i.e., only alphanumeric characters
are compared.
.It Fl f
Ignore the case of alphabetic characters.
.It Fl t 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
.Pp
The
.Nm
utility exits 0 if one or more lines were found and displayed,
1 if no lines were found, or >1 if an error occurred.
.Sh FILES
.Bl -tag -width /usr/share/dict/words -compact
.It Pa /usr/share/dict/words
the dictionary
.El
.Sh SEE ALSO
.Xr grep 1 ,
.Xr sort 1
.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.
.Sh HISTORY
The
.Nm
command appeared in
.At v7 .