1.\" $NetBSD: look.1,v 1.8 2003/08/07 11:14:27 agc Exp $ 2.\" 3.\" Copyright (c) 1990, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" @(#)look.1 8.1 (Berkeley) 6/14/93 31.\" 32.Dd June 14, 1993 33.Dt LOOK 1 34.Os 35.Sh NAME 36.Nm look 37.Nd display lines beginning with a given string 38.Sh SYNOPSIS 39.Nm 40.Op Fl df 41.Op Fl t Ar termchar 42.Ar string 43.Op Ar file 44.Sh DESCRIPTION 45The 46.Nm 47utility displays any lines in 48.Ar file 49which contain 50.Ar string 51as a prefix. 52As 53.Nm 54performs a binary search, the lines in 55.Ar file 56must be sorted. 57.Pp 58If 59.Ar file 60is not specified, the file 61.Pa /usr/share/dict/words 62is used, only alphanumeric characters are compared and the case of 63alphabetic characters is ignored. 64.Pp 65Options: 66.Bl -tag -width Ds 67.It Fl d 68Dictionary character set and order, i.e. only alphanumeric characters 69are compared. 70.It Fl f 71Ignore the case of alphabetic characters. 72.It Fl t 73Specify a string termination character, i.e. only the characters 74in 75.Ar string 76up to and including the first occurrence of 77.Ar termchar 78are compared. 79.El 80.Pp 81The 82.Nm 83utility exits 0 if one or more lines were found and displayed, 841 if no lines were found, and \*[Gt]1 if an error occurred. 85.Sh FILES 86.Bl -tag -width /usr/share/dict/words -compact 87.It Pa /usr/share/dict/words 88the dictionary 89.El 90.Sh SEE ALSO 91.Xr grep 1 , 92.Xr sort 1 93.Sh COMPATIBILITY 94The original manual page stated that tabs and blank characters participated 95in comparisons when the 96.Fl d 97option was specified. 98This was incorrect and the current man page matches the historic 99implementation. 100.Sh HISTORY 101.Nm 102appeared in 103.At v7 . 104