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+Calling Perl's in-built 'system()' function is easy; determining if
+it was successful is _hard_. Let's face it, '$?' isn't the nicest
+variable in the world to play with, and even if you _do_ check it,
+producing a well-formatted error string takes a lot of work.
+'IPC::System::Simple' takes the hard work out of calling external
+commands.