ack-grep software package provides grep-like program specifically for large source trees, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install ack-grep
ack-grep is installed in your system.
Make ensure the ack-grep package were installed using the commands given below,
$ sudo dpkg-query -l | grep ack-grep *
You will get with ack-grep package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Perl |
| Package | ack-grep |
| Version | 2.14-4 |
| Description | grep-like program specifically for large source trees |
| Sub Section | Perl |