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1 | .\" Copyright (c) 1990, 1993 |
2 | .\" The Regents of the University of California. All rights reserved. | |
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32 | .\" @(#)look.1 8.1 (Berkeley) 6/14/93 | |
33 | .\" | |
232dc924 | 34 | .TH LOOK 1 "June 2011" "util-linux" "User Commands" |
a5463f78 SK |
35 | .SH NAME |
36 | look \- display lines beginning with a given string | |
37 | .SH SYNOPSIS | |
38 | .B look | |
f49ccec2 BS |
39 | [options] |
40 | .IR "string " [ file ] | |
a5463f78 | 41 | .SH DESCRIPTION |
f49ccec2 | 42 | The |
a5463f78 | 43 | .B look |
6dbe3af9 | 44 | utility displays any lines in |
a5463f78 | 45 | .I file |
6dbe3af9 | 46 | which contain |
c5f29f23 | 47 | .IR string . |
6dbe3af9 | 48 | As |
a5463f78 | 49 | .B look |
6dbe3af9 | 50 | performs a binary search, the lines in |
a5463f78 | 51 | .I file |
7ab71099 BS |
52 | must be sorted (where |
53 | .BR sort (1) | |
54 | was given the same options | |
c5f29f23 | 55 | .BR "\-d " and/or " \-f " that |
a5463f78 | 56 | .B look |
eb63b9b8 | 57 | is invoked with). |
a5463f78 | 58 | .PP |
6dbe3af9 | 59 | If |
56cdb3f3 | 60 | .I file |
6dbe3af9 | 61 | is not specified, the file |
56cdb3f3 | 62 | .I /usr/share/dict/words |
6dbe3af9 KZ |
63 | is used, only alphanumeric characters are compared and the case of |
64 | alphabetic characters is ignored. | |
a5463f78 SK |
65 | .SH OPTIONS |
66 | .TP | |
c5f29f23 BS |
67 | .BR \-a , " \-\-alternative" |
68 | Use the alternative dictionary file. | |
a5463f78 | 69 | .TP |
c5f29f23 | 70 | .BR \-d , " \-\-alphanum" |
9b480fe6 KZ |
71 | Use normal dictionary character set and order, i.e. only blanks and |
72 | alphanumeric characters are compared. This is on by default if no file is | |
73 | specified. | |
74 | ||
75 | Note that blanks have been added to dictionary character set for | |
76 | compatibility with \fBsort \-d\fR command since version 2.28. | |
a5463f78 | 77 | .TP |
c5f29f23 | 78 | .BR \-f , " \-\-ignore\-case" |
9b480fe6 KZ |
79 | Ignore the case of alphabetic characters. This is on by default if no file is |
80 | specified. | |
a5463f78 | 81 | .TP |
c5f29f23 | 82 | .BR \-t , " \-\-terminate " \fIcharacter\fR |
6dbe3af9 | 83 | Specify a string termination character, i.e. only the characters |
c5f29f23 | 84 | in \fIstring\fR up to and including the first occurrence of \fIcharacter\fR |
6dbe3af9 | 85 | are compared. |
a5463f78 | 86 | .TP |
c5f29f23 | 87 | .BR \-V , " \-\-version" |
b4362b6f | 88 | Display version information and exit. |
7ab71099 BS |
89 | .TP |
90 | .BR \-h , " \-\-help" | |
91 | Display help text and exit. | |
a5463f78 | 92 | .PP |
c5f29f23 BS |
93 | The |
94 | .B look | |
95 | utility exits 0 if one or more lines were found and displayed, 1 if | |
a5463f78 SK |
96 | no lines were found, and >1 if an error occurred. |
97 | .SH EXAMPLE | |
c5f29f23 | 98 | .RS |
a5463f78 SK |
99 | .nf |
100 | sort -d /etc/passwd -o /tmp/look.dict | |
101 | look -t: root:foobar /tmp/look.dict | |
102 | .nf | |
c5f29f23 | 103 | .RE |
a653878c SK |
104 | .SH ENVIRONMENT |
105 | .TP | |
106 | .B WORDLIST | |
107 | Path to a dictionary file. The environment variable has greater priority | |
108 | than the dictionary path defined in FILES segment. | |
a5463f78 | 109 | .SH FILES |
a5463f78 | 110 | .IP "\fB/usr/share/dict/words\fR" 4 |
6dbe3af9 | 111 | the dictionary |
a5463f78 | 112 | .IP "\fB/usr/share/dict/web2\fR" 4 |
c5f29f23 | 113 | the alternative dictionary |
a5463f78 SK |
114 | .SH "SEE ALSO" |
115 | .BR grep (1), | |
116 | .BR sort (1) | |
a5463f78 | 117 | .SH HISTORY |
0791a058 | 118 | The |
c5f29f23 | 119 | .B look |
0791a058 | 120 | utility appeared in Version 7 AT&T Unix. |
a5463f78 | 121 | .SH AVAILABILITY |
601d12fb | 122 | The look command is part of the util-linux package and is available from |
d673b74e | 123 | https://www.kernel.org/pub/linux/utils/util-linux/. |