cppreference.com > Other Standard C Functions > system system Syntax:
      #include <stdlib.h>
      int system( const char *command );
The system() function runs the given command as a system call. The return value is usually zero if the command executed without errors. If command is NULL, system() will test to see if there is a command interpreter available. Non-zero will be returned if there is a command interpreter available, zero if not. Related topics: exit getenv