1.\" Copyright (c) 1990, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)look.1 8.1 (Berkeley) 6/14/93 29.\" $FreeBSD: src/usr.bin/look/look.1,v 1.6.2.3 2002/06/21 15:27:58 charnier Exp $ 30.\" $DragonFly: src/usr.bin/look/look.1,v 1.3 2006/02/17 19:39:09 swildner Exp $ 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 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 >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 COMPATIBILITY 91The original manual page stated that tabs and blank characters participated 92in comparisons when the 93.Fl d 94option was specified. 95This was incorrect and the current man page matches the historic 96implementation. 97.Sh SEE ALSO 98.Xr grep 1 , 99.Xr sort 1 100.Sh HISTORY 101A 102.Nm 103utility appeared in 104.At v7 . 105