ksh software package provides The real, AT&T version of the Korn shell, 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 ksh
ksh is installed in your system.
Make ensure the ksh package were installed using the commands given below,
$ sudo dpkg-query -l | grep ksh *
You will get with ksh package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Shells |
| Package | ksh |
| Version | 93u-1 |
| Description | The real, AT&T version of the Korn shell |
| Sub Section | Shells |