ack

A search tool like grep, optimized for programmers. More information: https://beyondgrep.com/documentation/.

Find files containing "foo":

ack {{foo}}

Find files of a specific type:

ack --ruby {{foo}}

Count the total number of matches for the term "foo":

ack -ch {{foo}}

Show the file names containing "foo" and number of matches in each file:

ack -cl {{foo}}

Search a file for a specified string:

ack bar "{{foo bar}}" {{path/to/file}}

Search a file for the specified regex pattern:

ack bar "{{[bB]ar \d+}}" {{path/to/file}}

List all valid types:

ack --help-types