tldr/pages/linux/look.md

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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}}