1.\" Copyright (c) 1990, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)look.1 8.1 (Berkeley) 06/14/93 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.Op Fl t Ar termchar 18.Ar string 19.Op Ar file 20.Sh DESCRIPTION 21The 22.Nm look 23utility displays any lines in 24.Ar file 25which contain 26.Ar string 27as a prefix. 28As 29.Nm look 30performs a binary search, the lines in 31.Ar file 32must be sorted. 33.Pp 34If 35.Ar file 36is not specified, the file 37.Pa /usr/share/dict/words 38is used, only alphanumeric characters are compared and the case of 39alphabetic characters is ignored. 40.Pp 41Options: 42.Bl -tag -width Ds 43.It Fl d 44Dictionary character set and order, i.e. only alphanumeric characters 45are compared. 46.It Fl f 47Ignore the case of alphabetic characters. 48.It Fl t 49Specify a string termination character, i.e. only the characters 50in 51.Ar string 52up to and including the first occurrence of 53.Ar termchar 54are compared. 55.El 56.Pp 57The 58.Nm look 59utility exits 0 if one or more lines were found and displayed, 601 if no lines were found, and >1 if an error occurred. 61.Sh FILES 62.Bl -tag -width /usr/share/dict/words -compact 63.It Pa /usr/share/dict/words 64the dictionary 65.El 66.Sh SEE ALSO 67.Xr grep 1 , 68.Xr sort 1 69.Sh COMPATIBILITY 70The original manual page stated that tabs and blank characters participated 71in comparisons when the 72.Fl d 73option was specified. 74This was incorrect and the current man page matches the historic 75implementation. 76.Sh HISTORY 77.Nm Look 78appeared in Version 7 AT&T Unix. 79