05-11-2010
You can call an external function or library from certain shells (bash, ksh93, zsh) if you know exactly what you are doing. It is not a trivial exercise and it is fraught with danger. In fact you can also go the other way with ksh93 and invoke ksh93 internal shell functionality from an application.
Here are pointers to some posts I have written on the subject for ksh93 which should help you understand the issues:
KSH93 Custom Builtins 1
KSH93 Custom Builtins II
KSH93 libshell
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