7.1. IntroductionThe Korn shell is available for Linux as the Public Domain Korn Shell (pdksh), a public domain reimplementation that is intended to be a clone of the UNIX ksh. Although sometimes not installed in the default set of Linux packages, pdksh is included in most Linux distributions. Another Linux shell, the Z shell (zsh, written by Paul Falstad), also implements most features of the Korn shell, but does not claim complete compatibility with the original Korn shell. The Korn shell supports all of the shell facilities described in Chapter 5, "The Linux Shells," as well as the control structures and conditional expressions described in Chapter 6, "The Bourne Again Shell." The following features unique to the Korn shell are discussed in this chapter:
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