GNU/Linux Ubuntu 20.04 Installing pdksh Guide
The Guide shows you Step-by-Step How to Install pdksh Package for Ubuntu 20.04 Focal LTS GNU/Linux – Step by step Tutorial.
And the Public Domain Korn Shell “pdksh“ is a mostly complete AT&T ksh look-alike, but has been Superseded by mksh.
Moreover, mksh (MirBSD Korn Shell) Transitional Dummy Package exists to fulfil the needs of existing Users, Dependencies and Build-dependencies by providing pdksh Symlinks to the legacy flavour of mksh.

1. Launching Terminal
Open a Command Line Terminal Window
(Press “Enter” to Execute Commands)
Ctrl+Alt+T on desktop.
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