ed software package provides classic UNIX line editor, 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 ed
ed is installed in your system.
Make ensure the ed package were installed using the commands given below,
$ sudo dpkg-query -l | grep ed *
You will get with ed package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Editors |
| Package | ed |
| Version | 1.5-3 |
| Description | classic UNIX line editor |
| Sub Section | Editors |