AFAIU, this thread has turned to be about interfacing whatever app to a scripting language. I consider this a very usefull feature for all but basic applications. In particular, I consider that interfacing init - The init program which is pid 1 - with a scripting language would provide ultimate "init freedom". There are few things the shell cannot do well enough to be a good init program; but I don't think it is possible to interface an application with the shell, I mean let the shell execute commands belonging to the application without forking a process.

To come back to the list of scripting languages, I remember one very nice feature of Lua: AFAIR it has built in multitasking primitives. Another language was designed precisely to be interfaced to applications: Tcl. With Tk, it also involves the toolbox to make a GUI.

    My two cents.
                            Didier
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