What is KornShell?

KornShell (ksh) is a Unix shell developed by David Korn at Bell Labs. It is an interactive command language and a scripting language. It's known for its backwards compatibility with the Bourne shell (sh) and includes features from the C shell (csh), such as command history and aliases. It's commonly used for writing shell scripts for system administration tasks, automation, and general-purpose programming on Unix-like systems.