What is ksh?

Ksh (Korn shell) is a Unix shell developed by David Korn of AT&T Bell Laboratories. It is an extended version of the standard Bourne shell (sh), which includes many additional features to enhance the interactive user experience and execution efficiency.

Ksh includes several features that distinguish it from other shells, such as command line editing, history and aliasing. It also supports scripting and programming in addition to its interactive mode, allowing advanced users to automate complex tasks.

Ksh is available on most Unix and Unix-like systems, including Linux, macOS, and Solaris. It has been used as the default shell on some versions of Unix, such as AIX and HP-UX.

Overall, ksh is a powerful and versatile shell, widely used by system administrators, developers, and advanced users for various tasks and purposes.