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KornShell

KornShell (ksh93) is a Unix command shell and programming language created by David Korn at AT&T Bell Laboratories. It was later developed as open source by AT&T Software Technology, and the actively maintained ksh 93u+m continuation is distributed under the Eclipse Public License 2.0.

Licensing at a Glance

  • Open source

  1. KSH-93 is the version of the KornShell language described in the book by Morris Bolsky and David Korn of AT&T Bell Laboratories, and is upward compatible with the Bourne shell.[1]

  2. ksh 93u+m continues from the last stable AT&T release (93u+ 2012-08-01) and was forked from the AT&T AST repository, which is no longer actively developed.[2]

  3. The ksh 93u+m source is licensed under the Eclipse Public License version 2.0; any use, reproduction or distribution of the program constitutes acceptance of that licence.[3]

Products

References

  1. KornShell 93u+m README · raw.githubusercontent.com · retrieved 2026-09-27
  2. KornShell 93u+m README · raw.githubusercontent.com · retrieved 2026-09-27
  3. ksh LICENSE.md · raw.githubusercontent.com · retrieved 2026-09-27
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