2.3.3 system()

int system(string cmd_str)
system() synchronously passes the string cmd_str to the environment (host operating system) for execution. Because the call is synchronous, the script does not return from this function until the command in cmd_str has completed.
If cmd_str is "" (empty string) and there is a command processor, system() returns a nonzero value.
If cmd_str is not "" (empty string), the return value is implementation dependent.
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