Update cheatsheets

ack

@@ -0,0 +1,42 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# 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`