One of the things with which I am struggling right now is perl. At work, I inherited this set of perl programs. One of them, used for setting up things, needs to run set-userid (a way for someone using the program to take actions as if they were some other user).

For some reason, this past week I discovered that the specialness of the program has disappeared. That is to say, when within the program I execute the command to say who I am, I'm not the userid I should be.

And so I am searching for reasons and techniques to solve the problem.