KornShell (ksh) is a Unix shell which was developed by David Korn at Bell Labs in the early 1980s & announced at USENIX on July 14, 1983. Other early The Bourne shell (sh), was the default Unix shell of Unix Version 7. Most Unix- like systems continue to have /bin/sh—which will be the Bourne shell, or a Microsoft once included a version of the Korn shell produced by Mortice Kern Systems (MKS) in a UNIX integration The most influential Unix shells have been the Bourne shell & the C shell. The Bourne shell, sh, was written by Stephen Bourne at AT&T as the original Unix