text: #ifndef __RESU_H__
  #define __RESU_H__
  
  #include <stdio.h>
  #include <stdlib.h>
  
  void check_args(int argc, char **argv);
  void parse_user(char *user_group, char **out_group);
  void usage(FILE *f);
  
  void testable_exit(int status);
  
  #endif /* !__RESU_H__ */
  