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Subject: Re: [TUHS] PDP-7 UNIX filesystem
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> Also, I only now realized that only mknod existed, up until a long time,
>
> only later on with the GNU coreutils did mkdir as a command come into
> existence. Running the PDP-11 v7 on SIMH showed that, gotten so accustomed
>
> to the Linux env that thinking backwards seemed suddenly arcane.
>
that's not true. mkdir isn't a GNU invention. Its much older.

https://en.wikipedia.org/wiki/Mkdir#History
http://man7.org/linux/man-pages/man2/mknod.2.html