grep software package provides GNU grep, egrep and fgrep, you can install in your Ubuntu 12.04 LTS (Precise Pangolin) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install grep
grep is installed in your system.
Make ensure the grep package were installed using the commands given below,
$ sudo dpkg-query -l | grep grep *
You will get with grep package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Utilities |
| Package | grep |
| Version | 2.10-1 |
| Description | GNU grep, egrep and fgrep |
| Sub Section | Utils |