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How do I run the command "printaroni SERVER_INFO.txt?

first make sure you are in the right folder, by typing the command "listaroni" into the terminal. if you are in the "/usr/bin/notes" folder, you can just type "printaroni SERVER_INFO.txt" into the terminal to see the contents!

No, I meant, how do I enable caps lock in-game?

you can hold SHIFT to get capital  letters, I'm not sure about caps lock support though.