C++ GUI and Linux

I want to make an application to automate some tasks under linux using C++ and GUI API(Qt, wxWidgets, GTKmm) with linux built-in applications such as ls, cp, mv, rename, ... like using popen and pclose, but I don't know how to get the return values from these commands. So I'm asking your your help for advice about ebooks, tutos, refrence, ... Anything that might help me
You might want to look into using an embedded scripting language.

or even just the system function, it might not be "secure" but if you're just using it for a personal use program, then it'll be fine.
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