Reverse shell of 237 bytes. How to reduce the executable file using Linux hacks

Once I was asked: is it possible to write a reverse shell some 200 bytes in size? This shell should perform the following functions: change its name and PID on a regular basis, make you coffee, and hack the Pentagon… Too bad, this is most likely impossible. But the task seemed interesting and challenging to me. Let’s see whether it can be implemented.
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