in reply to
A question about the best way to use subroutines
Sometimes it is good just to work out the steps of your program in different subroutines. It makes it very understandable and clear.
E.g. i am sleepy now, so
# i don't go into details about the subs now :-)
Sometimes it is very useful to store your reusable routines in separate files, in a common directory, and include them in your script, but be careful, too much include files messes up everything. Be smart. :-)