Okay, I was afraid something like that might happen. This may sound like a stupid idea, but why not try to cut a tab out from a text file and paste it in?
You could also try to find out which encoding the Mac terminal uses, then find out what code you need to generate a tab and use that- for example, in Windows, you can generate an ASCII character by holding AltGr and typing the decimal value of that character, there should be something similar for Macs.
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