tldr/pages/common/ack.md

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