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I would also recommend the legendary Teensy Files:

https://www.muppetlabs.com/~breadbox/software/tiny/

They sparked my interest in ELF and freestanding programs.

If anyone's interested, last year I replicated this exercise for an x86-64 Linux executable [0], and also golfed a Hello World as small as I could. I ended up using a little-known pattern (an ET_DYN executable with no interpreter, normally only used for the ld.so binary) to shave off more bytes than anyone else who had tried it, to the best of my knowledge.

[0] https://tmpout.sh/3/22.html

And Chris Wellons' "A Magnetized Needle and a Steady Hand," detailing how to build an ELF implementation of 'true' using nothing more than 'echo' or 'printf': https://nullprogram.com/blog/2016/11/17/

Huge fan of that blog and its author!

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