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 termination 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}}`