If you don't want the trouble of converting your scripts to .pm modules, but you can share a bunch of subroutines across multiple scripts by 1) putting them in a separate file (say snmplib.pl) 2) adding a 1; to the end of the snmplib.pl file, and 3) putting a code fragment at the beginning of scripts which would call those subroutines like
in reply to Creating module files from subroutines
It's not as elegant as modules and it's not particularly mod_perl friendly, but it works and is imho quicker to implement. (It is true that global variables in the two files are accessible to each other with this approach, not encapsulated and filtered through well-defined EXPORT interfaces, but you may or may not care about that depending on how your code works.) Perhaps some more experienced monk will tell you (and me) why not to do it this simple way.