look

Display lines beginning with a prefix in a sorted file. Note: the lines in the file must be sorted. See also: grep, sort. More information: https://man.openbsd.org/look.

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

look prefix path/to/file

• Case-insensitively ([f]) search only on alphanumeric characters ([d]):

look -f -d prefix path/to/file

• Specify a string [t]ermination character (space by default):

look -t ,

• Search in /usr/share/dict/words (-d and -f are assumed):

look prefix