#include <sys/types.h>
#include <libutil.h>
#include <stdio.h>
#include <stdlib.h>

main(int ac, char **av)
{
        if (ac == 1) {
	 fprintf(stderr, "usage: logout tty<line>\n");
	  return 1;
	}
	if((logout(av[1])==0)){
         fprintf(stderr, "No one logged on %s\n", av[1]);
         return 1;
	}
}