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Linux Command Line and Shell Scripting Bible - Third Edition
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As you start writing more complex shell scripts, you'll find yourself reusing parts of code that perform specific tasks. Sometimes, it's something simple, such as displaying a text message and retrieving an answer from the script users. Other times, it's a complicated calculation that's used multiple times in your script as part of a larger process.
In each of these situations, it can get tiresome writing the same blocks of code over and over in your script. It would be nice to just write the block of code once and be able to refer to that block of code anywhere in your script without having to rewrite it.
The bash shell provides a feature allowing you to do just that. Functions are blocks of script code that you assign a name to and reuse anywhere in your code. Anytime you need to use that block of code in your script, you simply use the function name you assigned it (referred to as calling the function). This section describes how to create...
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