1.\" Copyright (c) 1990 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)look.1 6.6 (Berkeley) 07/21/91 7.\" 8.Dd 9.Dt LOOK 1 10.Os 11.Sh NAME 12.Nm look 13.Nd display lines beginning with a given string 14.Sh SYNOPSIS 15.Nm look 16.Op Fl df 17.Ar string 18.Op Ar file 19.Sh DESCRIPTION 20The 21.Nm look 22utility displays any lines in 23.Ar file 24which contain 25.Ar string 26as a prefix. 27As 28.Nm look 29performs a binary search, the lines in 30.Ar file 31must be sorted. 32.Pp 33If 34.Ar file 35is not specified, the file 36.Pa /usr/share/dict/words 37is used, only alphanumeric characters are compared and the case of 38alphabetic characters is ignored. 39.Pp 40Options: 41.Bl -tag -width Ds 42.It Fl d 43Dictionary character set and order, i.e. only alphanumeric characters 44are compared. 45.It Fl f 46Ignore the case of alphabetic characters. 47.El 48.Pp 49The 50.Nm look 51utility exits 0 if one or more lines were found and displayed, 521 if no lines were found, and >1 if an error occurred. 53.Sh FILES 54.Bl -tag -width /usr/share/dict/words -compact 55.It Pa /usr/share/dict/words 56the dictionary 57.El 58.Sh SEE ALSO 59.Xr grep 1 , 60.Xr sort 1 61.Sh COMPATIBILITY 62The original manual page stated that tabs and blank characters participated 63in comparisons when the 64.Fl d 65option was specified. 66This was incorrect and the current man page matches the historic 67implementation. 68.Sh HISTORY 69.Nm Look 70appeared in Version 7 AT&T Unix. 71