Display lines beginning with a given string. As look performs a binary search, the lines in file must be sorted.

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


     -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.

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.

The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of the look utility. Their effect is described in environ(7).

 /usr/share/dict/words the dictionary

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.

Lines are not compared according to the current locale's collating order. Input files must be sorted with LC_COLLATE set to `C'.

“Enjoy the little things, for one day you may look back and realize they were the big things” ~ Robert Brault


look man page - Apple.com
grep - Search file(s) for lines that match a given pattern
sort - Sort text files

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