So I am interested in how UnZip handles it's -l function and would like to see the source code for it.
Where could I get my hands on that source code?
To see the source used in the Ubuntu package, go to:
https://code.launchpad.net/ubuntu/+source/unzip
You can also use:
apt-get source unzip
You may need to enable source repositories in your software preferences for the second option.
General rule: