tldr/pages/common/ack.md

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# ack
> A search tool like `grep`, optimized for developers.
> See also: `rg`, which is much faster.
> More information: <https://beyondgrep.com/documentation>.
- Search for files containing a string or regular expression in the current directory recursively:
`ack "{{search_pattern}}"`
- Search for a case-insensitive pattern:
`ack --ignore-case "{{search_pattern}}"`
- Search for lines matching a pattern, printing [o]nly the matched text and not the rest of the line:
`ack -o "{{search_pattern}}"`
- Limit search to files of a specific type:
`ack --type {{ruby}} "{{search_pattern}}"`
- Do not search in files of a specific type:
`ack --type no{{ruby}} "{{search_pattern}}"`
- Count the total number of matches found:
`ack --count --no-filename "{{search_pattern}}"`
- Print the file names and the number of matches for each file only:
`ack --count --files-with-matches "{{search_pattern}}"`
- List all the values that can be used with `--type`:
`ack --help-types`