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LOOK(1)                   BSD General Commands Manual                  LOOK(1)


look - display lines beginning with a given string


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


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 charac- ters is ignored. Options: -d Dictionary character set and order, i.e. only alphanumeric char- acters 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.


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


grep(1), sort(1)


The original manual page stated that tabs and blank characters partici- pated in comparisons when the -d option was specified. This was incor- rect and the current man page matches the historic implementation.


Look appeared in Version 7 AT&T Unix.


The look command is part of the util-linux-ng package and is available from BSD June 14, 1993 BSD