I bought CK2 years back, in a pack with all the then-existing DLCs. Then they added a lot more. I'm just defeated, I give up. I refuse to deal with products that don't have a clear feature-set and pricing. You don't have to deal with those studios when there are so many out there that don't actively try to squeeze you.
My question was about how "tar xvzf" should be called "untar".
Your reply might still make sense (i.e. untar could automagically figure it out), but I was highlighting how tar/untar today also means (de)compressing that tar archive using many different compression formats.