So this is pretty neat. From the code we can see that:

If you set the console switches of the PDP-11 to the magic number 173030 init executes "/bin/sh -" on the console tty (probably a decwriter).

Otherwise it starts /etc/getty on /dev/tty0 - tty8, ttya, and ttyb.

It also starts /etc/dpd ("Dpd is the 201 data phone daemon. It is designed to submit jobs to the Honeywell 6070 computer via the GRTS interface."), /usr/mel/da (???) and /usr/demo/dds (???).

When user logs out it's copying the utmp entry to wtmp.

I can see that the init binary is 456 bytes.

It's mounting hard drives /dev/rk1-rk3 on /usr, /sys and /crp. Maybe no /etc/fstab yet. I guess /dev/rk0 had root.

voltagex_

>maybe no /etc/fstab yet

Not in that repo https://github.com/DoctorWkt/unix-jun72/search?utf8=%E2%9C%9... (github mirror picked at random).

I'm not sure what the easiest way to find out when fstab was added would be.

cremno

Reading man pages and hoping they're correct:

http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man5/...

>The fstab file format appeared in 4.0BSD.

Someone

I would look in the git repository for Unix: https://github.com/dspinellis/unix-history-repo. It isn't guaranteed to be correct, either, but should have a commit describing its addition that can be trusted slightly more.

The earlier i can find there without digging deep is BSD 4.4 Lite, a mega-commit by Rodney Grimes (https://github.com/dspinellis/unix-history-repo/commit/d2273...)

Being an enormous commit, changes are that it merged in existing stuff.