extern int do_cp (const char *src, const char *dest);
extern int do_cp_a (const char *src, const char *dest);
extern int do_mv (const char *src, const char *dest);
extern int do_cp (const char *src, const char *dest);
extern int do_cp_a (const char *src, const char *dest);
extern int do_mv (const char *src, const char *dest);