protected Varargs execute(String command){
  return varargsOf(NIL,valueOf("exit"),ONE);
}

protected Varargs execute ( String command ) { return varargsOf ( NIL , valueOf ( "exit" ) , ONE ) ; }
this function is equivalent to the c function system . it passes command to be executed by an operating system shell . it returns a status code , which is system - dependent . if command is absent , then it returns nonzero if a shell is available and zero otherwise .
