At 2023-01-20T14:44:51-0800, ron minnich wrote:
I am trying to remember when fd 2 (aka stderr) became
a thing. I have
a vague memory that it was post-v6 but that may be way off.
The story goes that it swiftly followed the creation of troff.
https://minnie.tuhs.org/pipermail/tuhs/2013-December/006113.html
Regards,
Branden