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Re:Generating executable files from scratch by zmodem on Tuesday June 13, 2017 @04:43PM (#14548457)
Even more from scratch (e.g. without using elf.h) and also for Win and Mac: http://www.hanshq.net/making-executables.html
Re:Generating executable files from scratch by cylinder714 on Wednesday June 14, 2017 @12:08AM (#14550596)
A Magnetized Needle and a Steady Hand:

http://nullprogram.com/blog/2016/11/17/

(when all you've got is `echo', and presumably `cat')