The Korn shell (ksh) is a Unix shell developed by David Korn of Bell Labs in the early 1980s. It is an interactive command-line interpreter and scripting language that provides advanced features such as command-line editing, history, job control, and shell programming constructs. The Korn shell is backward-compatible with the Bourne shell (sh) and includes many features of the C shell (csh) and the TC shell (tcsh). It is widely used on Unix and Linux systems and is considered one of the most powerful and versatile shells available.
