look

Display lines beginning with a prefix in a sorted file. See also: grep, sort. More information: https://man.freebsd.org/cgi/man.cgi?look.

• Search for lines beginning with a specific prefix in a specific file:

look prefix path/to/file

• Case-insensitively search only on alphanumeric characters:

look -f|–ignore-case -d|–alphanum prefix path/to/file

• Specify a string termination character (space by default):

look -t|–terminate ,

• Search in /usr/share/dict/words (--ignore-case and --alphanum are assumed):

look prefix