Introduction to KornShell
Most UNIX variants allow you to select among several shells. Because of its versatility and ease of use, many system administrators configure the KornShell for new users. The KornShell was derived from the Bourne Shell and has much of the same functionality of the Bourne Shell. ksh is the program you run on most UNIX systems, including HP-UX, that supplies KornShell functionality. It is also often referred to as the K shell. I use ksh throughout this chapter. You can use the ksh in the following three ways:
Interactively type commands on the command line.
Group commonly executed sets of commands into command files that you can execute by typing the name of the file.
Create KornShell programs using the structured programming ...