Is it possible to run ruby on an USB stick?

I can not hdinstall it on the machine (an old win 7 machine). I am not
supposed to make any changes to it.

BUT, I have so many ruby scripts and working with ruby is a 100000x
better than having to use drag-and-drop items or the DOS cmd.exe thingy.

So my question is - can I like install ruby on USB stick, with addons
(gems, and my files) and have that working?

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