The traditional approach to keeping an often-used function in a file is named a "module". You have already been shown the links to the modules and also links on how to install modules into a Perl.

Most likely, use lib will be enough, but a look at Yes, even you can use CPAN and/or local::lib won't hurt either.

In reply to Re^7: Can not use JSON module by Corion
in thread Can not use JSON module by tejD

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