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. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)look.1 8.1 (Berkeley) 6/14/93 33.\" $FreeBSD: src/usr.bin/look/look.1,v 1.6.2.3 2002/06/21 15:27:58 charnier Exp $ 34.\" $DragonFly: src/usr.bin/look/look.1,v 1.3 2006/02/17 19:39:09 swildner Exp $ 35.\" 36.Dd June 14, 1993 37.Dt LOOK 1 38.Os 39.Sh NAME 40.Nm look 41.Nd display lines beginning with a given string 42.Sh SYNOPSIS 43.Nm 44.Op Fl df 45.Op Fl t Ar termchar 46.Ar string 47.Op Ar 48.Sh DESCRIPTION 49The 50.Nm 51utility displays any lines in 52.Ar file 53which contain 54.Ar string 55as a prefix. 56As 57.Nm 58performs a binary search, the lines in 59.Ar file 60must be sorted. 61.Pp 62If 63.Ar file 64is not specified, the file 65.Pa /usr/share/dict/words 66is used, only alphanumeric characters are compared and the case of 67alphabetic characters is ignored. 68.Pp 69Options: 70.Bl -tag -width Ds 71.It Fl d 72Dictionary character set and order, i.e. only alphanumeric characters 73are compared. 74.It Fl f 75Ignore the case of alphabetic characters. 76.It Fl t 77Specify a string termination character, i.e. only the characters 78in 79.Ar string 80up to and including the first occurrence of 81.Ar termchar 82are compared. 83.El 84.Pp 85The 86.Nm 87utility exits 0 if one or more lines were found and displayed, 881 if no lines were found, and >1 if an error occurred. 89.Sh FILES 90.Bl -tag -width /usr/share/dict/words -compact 91.It Pa /usr/share/dict/words 92the dictionary 93.El 94.Sh COMPATIBILITY 95The original manual page stated that tabs and blank characters participated 96in comparisons when the 97.Fl d 98option was specified. 99This was incorrect and the current man page matches the historic 100implementation. 101.Sh SEE ALSO 102.Xr grep 1 , 103.Xr sort 1 104.Sh HISTORY 105A 106.Nm 107utility appeared in 108.At v7 . 109