extern int mt_main(int argc, char** argv);
extern int mv_main(int argc, char** argv);
extern int ping_main(int argc, char **argv);
+extern int poweroff_main(int argc, char **argv);
extern int printf_main(int argc, char** argv);
extern int ps_main(int argc, char** argv);
extern int pwd_main(int argc, char** argv);