1.4.1.3.
Shell functions
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Shell functions are a way to group commands for later execution using a single name for the group. They are executed just like a "regular" command. When the name of a shell function is used as a simple command name, the list of commands associated with that function name is executed.
Shell functions are executed in the current shell context; no new process is created to interpret them.
Functions are explained in Chapter 11.
