Today I was told a tale by a Unix trainer where the root password got leaked to the students, and one of the fellas removed the execute permission from
/usr/bin/chmod itself. How do you recover
chmod in this case and make it executable again? Let's say getting it from an external source or recompiling it is not a preferable option, is there some smart hack that can recover this
Note that this happened a long time ago and I'm not looking for a solution for some current problem, just curious about what ways Unix provides us around such an issue.