3 mkdir old_parent new_parent old_parent
/victim ||
exit 1
4 mv old_parent
/victim new_parent ||
exit 1
5 test -d old_parent ||
exit 1
6 test -d new_parent ||
exit 1
7 test -d old_parent
/victim
&& exit 1
8 test -d new_parent
/victim ||
exit 1
9 rmdir new_parent
/victim new_parent old_parent