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I have a Perl script. If it was called direct from the command line, I want to run sub main.
If it was called using require, I want to do nothing and wait for the caller script to call sub job at it’s leisure.
There’s a recommended Perl solution for code which needs to be runnable from a script as well as a perl module.
It’s usually called “modulino”, which can be used as Google or SO search term to find how-tos.
Here’s one how-to with reference links:
Perl script usable as a program and as a module