The Korn shell (ksh) is a Unix shell which was developed by David Korn (AT&T Bell Laboratories) in the early 1980s. It is backwards-compatible with the Bourne shell and includes many features of the C shell as well, such as a command history.
Reference for complex Korn shell scripting.
Resources and documentation with multiple versions and source code available for download.
Guide to programming in the Korn shell environment.
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