Provided by: bsdmainutils_6.1.10ubuntu2_i386 bug


     look - display lines beginning with a given string


     look [-df] [-t termchar] string [file ...]


     The look utility displays any lines in file which contain string as a

     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.


     -b      Use a binary search on the given word list. If you are ignoring
             case with -f or ignoring non-alphanumeric characters with -d, the
             file must be sorted in the same way. See sort(1) for more
             information on sorting files.

     -d      Dictionary character set and order, i.e. only alphanumeric
             characters are compared.

     -f      Ignore the case of alphabetic characters.

     -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


     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 uses a linear search by default instead of a binary search, which is
     what most other implementations use by default.


     A look utility appeared in Version 7 AT&T UNIX.