Display lines beginning with a given string. As look performs a binary search, the lines in file must be sorted.
Syntax look [-df] [-t termchar] string [file ...] Options: -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