#include <stdio.h>
#include <errno.h>
#include <stdlib.h>

int main(int argc, char *argv[]) {
if (argc != 3) {
	fprintf(stderr, "usage is: %s source dest\n", argv[0]);
	exit(1);
}
if (rename(argv[1], argv[2]) == -1)
	perror("cannot move");
return 0;
}