Zsh is a very powerful shell that is more popular than the commonly used Bash. It is highly interactive and flexible enough to customize it to your needs. It also comes with a powerful auto-completion functionality, along with recursive searches and a corrector included. For all that, some consider Zsh as an extended Bourne Shell.
By default, when we talk about a shell in Linux, most people think of Bash. It is true that it is the most wide spread and arguably one of the simplest shell to begin with, but there are also plenty of other shells out there yearning for your attention. Today, we shall go through another very famous shell: the Korn Shell (“ksh” for the intimates).