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 non-zero value.

If cmd_str is not "" (empty string), the return value is implementation-dependent.