# Search Files Specific To A Language

The `ack` command makes it easy to narrow the set of searched files to those
of a specific programming language. For instance, if you have a rails
project and only want to search the ruby files, use the `--ruby` flag with
your `ack` command.

```bash
$ ack --ruby Active
```

With the `--ruby` flag, I get a manageable number of results. Without it,
not so much.

```bash
$ ack --ruby Active | wc -l
      26
$ ack Active | wc -l
    5253
```

See `man ack` for more details.