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Message: [QUOTE="Jerry Coffin, post: 2545000"] What you're doing wrong is expecting the return value from system to mean something. Except when you pass a null pointer, the return value from system is implementation defined -- you can't (portably) depend on it meaning anything. In my own experience, it usually reflects one of two things -- it can reflect the return value from whatever you asked it to do. It can also, however, reflect only whether your invocation of the command processor itself succeeded -- i.e. whether what you specified was a valid command that could be executed to at least some degree (e.g. that it could find an executable named ping somewhere on the path -- but nothing more). I'm reasonably certain there is no portable way to do what you want. Almost every system I know of has some way to do it, but TTBOMK, it's never been standardized. [/QUOTE]