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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 characters is ignored.


     -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.

     /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 participated in comparisons when the -d option was
     specified.  This was incorrect 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 ftp://ftp.ker-

BSD                              June 14, 1993                             BSD