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GNU/Linux |
CentOS 5.5 |
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look(1) |
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LOOK(1) BSD General Commands Manual 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.
−f
Ignore the case of alphabetic characters.
−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.
BSD June 14, 1993 BSD
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