Download Shells: User's Guide

POSIX and Korn Shell Versus Other Shells
The POSIX and Korn Shell programs are command interpreters and
programming languages that execute commands entered from a terminal or le.
They are based on features found in the Bourne Shell and C Shell. POSIX and
Korn Shell maintain Bourne Shell's superior programming environment while
adding the unique command interpreting features of C Shell. They are 95%
upward compatible with the Bourne Shell, and most programs written under
the Bourne Shell will run under the POSIX and Korn Shells without change.
In developing POSIX and Korn Shell some of the features of the C Shell were
also incorporated. This blend creates a powerful shell with improved human
interface features and faster execution performance.
Features From C Shell
Some POSIX and Korn Shell features similar to C Shell features are:
History buer and history substitution capabilities.
File name completion.
Command aliasing mechanisms.
Arrays.
Integer arithmetic evaluation.
Tilde substitution.
Job control features.
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Part III:
POSIX and Korn Shell
FINAL TRIM SIZE : 7.5 in x 9.0 in
Introducing the Shells
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