There are so many errors in your subroutine that we are not sure what you are trying to do. I recommend that you study the documentation perlsub. I suspect that you are confusing us (and yourself) with a poor choice of variable names ($script1 for the name of a script file and $script2 for its output???). Given the code you have shown, $_ should not contain anything. You probably do not need a subroutine if all it does is extract the directory name from the script output. Use a regex with capture parenthesis in your main program.
We can provide much better help if you post a short program that we can run and duplicate your problem. Use use strict; use warnings and fix all errors and warnings that they cause. (Read the tutorial Short, Self-Contained, Correct Example)