tldr/pages/linux/look.md

look

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

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

look {{prefix}} {{path/to/file}}

• Case-insensitively search only on blank and alphanumeric characters:

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

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

look -{t|-terminate} {{,}}

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

look {{prefix}}

• Search in /usr/share/dict/web2 (--ignore-case and --alphanum are assumed):

look -{{a|-alternative}} {{prefix}}