LOOK(1)

NAME
look - display lines beginning with a given string

SYNOPSIS
look [-dfa] [-t termchar] string [file]

DESCRIPTION
The look utility displays any lines in file which contain string as a prefix. As look performs a binary search, the lines in file must be sorted (where sort(1) got the same options -d and/or -f that 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:

-d  Dictionary character set and order, i.e. only alphanumeric characters are compared. (On by default if no file specified).

-f  Ignore the case of alphabetic characters. (On by default if no file specified).

-a  Use the alternate dictionary /usr/share/dict/web2

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

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.

FILES
/usr/share/dict/words
    the dictionary
/usr/share/dict/web2
    the alternate dictionary

SEE ALSO
grep(1), sort(1)

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

HISTORY
Look appeared in Version 7 AT&T Unix.

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