A search tool like grep, optimized for programmers.
# To search for files containing a string or regular expression in the current directory recursively:
ack "<search_pattern>"
# To search for a case-insensitive pattern:
ack --ignore-case "<search_pattern>"
# To search for lines matching a pattern, printing [o]nly the matched text and not the rest of the line:
ack -o "<search_pattern>"
# To limit search to files of a specific type:
ack --type=<ruby> "<search_pattern>
# To do not search in files of a specific type:
ack --type=no<ruby> "<search_pattern>
# To count the total number of matches found:
ack --count --no-filename "<search_pattern>"
# To print the file names and the number of matches for each file only:
ack --count --files-with-matches "<search_pattern>"
# To list all values that can be used with '--type':
ack --help-types