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/bin/true used to be an empty file. The shell would open it, do nothing, and exit with a true status code.
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When the Unix Support Group (development organization at Bell Labs) formalized everything, they gave it a long SCCS header, as they did every other file, and then needed to add "exit 0" at the end. The file was therefore infinitely larger than before.
At some point, somewhere (not sure where) it was decided this was poor engineering, probably because the shell spends time reading that big SCCS header as a comment one byte at a time.
(It probably became a shell builtin somewhere along the line too, but that's for someone else to study.)
The command moved to /usr/bin/true. I don't know when, where and especially why.
Eventually to avoid the unbearable overhead of executing a comment that shouldn't be there at all, someone rewrote true as a C program. What was once an empty file is now a non-portable executable binary compiled from C.
This is why we can't have good software. This program could literally have been an empty file, a nothing at all, a name capturing the essence perfectly.
But the inexorable forces of improvement dictate we can't accept that, so here we are: % file /usr/bin/true /usr/bin/true: Mach-O 64-bit executable x86_64 % Instead of: % file true true: empty % true % echo $? 0 %
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Wait for the systemd replacement 
systemd-truthd. Returns true unless your hostname includes a number.
In Python 2, "while 1:" is optimized by the compiler whereas "while True:" evaluates "True" variable at each iteration. True can technically be modified (ex: True=False). In Python 3, True became a keywork and so is optimized too.
Eyes opened to the emptiness of /bin/true via snark at an ancient Usenix during convo re: releasing source code, when one wag quipped s/t like “well, what about the source to /bin/true, will the lawyers clear that?”
On some old systems replacing /usr/bin/perl with an empty file results in a big improvement
looking at the sauce https://git.io/true.c it seems like ~25% of the code exists simply to support the --help and --version flags
Why the hell does anybody need help and version flags?
Need to find out when true is true, of course!
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