grep software package provides GNU grep, egrep and fgrep, you can install in your Debian 7 (Wheezy) 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 | Debian 7 wheezy |
| Section | Utilities |
| Package | grep |
| Version | 2.12-2 |
| Description | GNU grep, egrep and fgrep |
| Sub Section | Utils |