From Fedora Project Wiki

MirBSD Korn Shell

Mksh is the MirBSD enhanced version of the Public Domain Korn shell (pdksh), a bourne-compatible shell which is largely similar to the original AT&T Korn shell. It includes bug fixes and feature improvements in order to produce a modern, robust shell good for interactive and especially script use, being a bourne shell replacement, pdksh successor and an alternative to the C shell.

How To Install

Mksh is available in Fedora since Fedora Core 6. It can be easily installed by typing (as root):

yum install mksh

If you would like to quick start, just run the following command:

mksh -l

It can be useful to copy the example .mkshrc into your home directory:

cp /usr/share/doc/mksh-*/dot.mkshrc ~/.mkshrc

Now you're running the MirBSD Korn Shell. Further information can be found on the mksh website.