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Oh-my...! That was indeed not a direction I was looking. Using type buf answers my question about finding out the source of the alias-like behavior. For now I'll just run command buf when I need it.
You have not mentioned which distribution you are using. So I assumed it is a distribution that brings the sudo command and that your user is configured to be allowed to use it.
Thanks for the suggestion @NasirRiley. I did catch something around that topic, but I'm not so much into that Linux family. So I just made a small mention. I've updated the answer.
