Chapter 9. The Tc Shell

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Shell Scripts 340

Entering and Leaving the TC Shell 341

Features Common to the Bourne Again and TC Shells 343

Redirecting Standard Error 349

Word Completion 350

Editing the Command Line 353

Variables 355

Reading User Input 361

Control Structures 368

Builtins 377

The TC Shell (tcsh) performs the same function as the Bourne Again Shell and other shells: It provides an interface between you and the Linux operating system. The TC Shell is an interactive command interpreter as well as a high-level programming language. Although you use only one shell at any given time, you should be able to switch back and forth comfortably between shells as the need arises (you may want to run different shells in different windows). Chapters 8 and 11 apply to tcsh as well as to bash so they provide a good background for this chapter. This chapter explains tcsh features that are not found in bash and those that are implemented differently from their bash counterparts. The tcsh home page is

The TC Shell is an expanded version of the C Shell (csh), which originated on Berkeley UNIX. The "T" in TC Shell comes from the TENEX and TOPS-20 operating systems, which inspired command completion and other features in the TC Shell. A number of features not found in csh are present in tcsh, including file and username completion, command line editing, and spelling correction. As with csh, you can customize tcsh to make it more tolerant of mistakes and easier to use. By setting the proper shell variables, you can have tcsh warn you when you appear to be accidentally logging out or overwriting a file. Many popular features of the original C Shell are now shared by bash and tcsh.

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    A Practical Guide to LinuxR Commands, Editors, and Shell Programming
    A Practical Guide to LinuxR Commands, Editors, and Shell Programming
    ISBN: 131478230
    EAN: N/A
    Year: 2005
    Pages: 213 © 2008-2017.
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