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Chapter 4. The Bourne Shell and Korn Shell


Overview of Features
Arithmetic Expressions
Command History
Job Control
Invoking the Shell
Restricted Shells
Built-in Commands (Bourne and Korn Shells)

This chapter presents the following topics: provides considerable information about the Korn shell. Follow the links there for binaries of ksh93 that can be downloaded for noncommercial and educational use. See also Learning the Korn Shell, which is listed in the Bibliography.

4.1. Overview of Features

The Bourne shell is the standard shell and provides the following features:

The Korn shell is a backward-compatible extension of the Bourne shell. Features that are valid only in the Korn shell are so indicated:

ksh93 adds the following capabilities:

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