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