Name

look — display lines beginning with a given string

Synopsis

look [options] string [file]

DESCRIPTION

The look utility displays any lines in file which contain string. As look performs a binary search, the lines in file must be sorted (where sort(1) got the same options −dand/or −fthat look is invoked with).

If file is not specified, the file /usr/share/dict/words is used, only alphanumeric characters are compared and the case of alphabetic characters is ignored.

OPTIONS

−a, −−alternative

Use the alternative dictionary file.

−d, −−alphanum

Use normal dictionary character set and order, i.e. only alphanumeric characters are compared. (This is on by default if no file is specified.)

−f, −−ignore−case

Ignore the case of alphabetic characters. (This is on by default if no file is specified.)

−t, −−terminate character

Specify a string termination character, i.e. only the characters in string up to and including the first occurrence of character are compared.

−h, −−help

Display help text and exit.

−V, −−version

Output version information and exit.

The look utility exits 0 if one or more lines were found and displayed, 1 if no lines were found, and >1 if an error occurred.

EXAMPLE

sort -d /etc/passwd -o /tmp/look.dict
look -t: root:foobar /tmp/look.dict

FILES

/usr/share/dict/words

the dictionary

/usr/share/dict/web2

the alternative dictionary

SEE ALSO

grep(1), sort(1)

COMPATIBILITY

The original manual page stated that tabs and blank characters participated in comparisons when the alphanum option was specified. This was incorrect, and the current man page matches the historic implementation.

HISTORY

The look utility appeared in Version 7 AT&T Unix.

AVAILABILITY

The look command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.


  Copyright (c) 1990, 1993
The Regents of the University of California.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by the University of
California, Berkeley and its contributors.
4. Neither the name of the University nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.

    (#)look.1 8.1 (Berkeley) 6/14/93