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Part V: Under Mac OS X's Hood > Shells and Shell Programming

Chapter 21. Shells and Shell Programming

As discussed in Chapter 19, a shell is a command-line interpreter program. It receives your typed-in commands when using the Terminal (or a similar program) and decides what to do with it. You can also use a shell in batch mode, treating it like an interpreted programming language and feeding it an entire scriptful of statements to execute, possibly including logic and flow control statements.

This chapter covers the shells included with Mac OS X, along with tcsh, its default shell program.


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