On Wed, Aug 3, 2011 at 8:24 PM, Michael Davidson
<m_d@pacbell.net> wrote:
You probably don't have /usr/bin because you haven't mounted /usr yet.
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That's a good hypothesis, especially given the info I presented, but I do have -some- things under /usr, and if I manually rerun sh -x /etc/rc in multiuser, I get an error about /usr already being mounted.
On V7 as best I can remember. /usr was always a mounted filesystem.
So, somewhere in your V7 image there should be a disk image for /usr that can be hooked up to an appropriate device under SIMH and then mounted. |
Actually, it might already be there if your disk image is the entire device and not just the root filesystem - if you can figure out what your root device is then I would expect /usr to be on the same major device number but with aminor device # of 2 (root being 0 and swap being 1).
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I'm thinking /usr is /dev/rp3, because my /etc/rc looks like:
# cat /etc/rc
PATH=/bin:/usr/bin
echo "Restricted rights: Use, duplication, or disclosure
is subject to restrictions stated in your contract with
Western Electric Company, Inc." >/dev/console
rm /etc/mtab
cat /dev/null >/etc/utmp
/etc/mount /dev/rp3 /usr
rm -f /usr/spool/lpd/lock
: /etc/accton /usr/adm/acct
rm -f /usr/tmp/*
rm -f /tmp/*
/etc/update
date >/dev/console
/etc/cron
| Actually if you just take the system multi-user it might even do it for you. |
This does seem to at least try to mount /usr for me - hitting ctrl-d at the initial singleuser #, that is.
Interestingly though, it seems that the number of directories in /usr is the same on first boot into single user, as after /etc/rc has run as part of entering multiuser, so perhaps my root filesystem has things in /usr that would normally be obscured by a /usr mount. Also, /etc/mtab seems untouched (in fact, it's nonexistent) after entering multiuser, and the output of /etc/mount continues to be nothing.
touch /t does create a file named t in the root directory, so it's not something about the root filesystem being readonly.
I'm puzzled. And yet, I'm enjoying it. :)
Any suggestions?
--- On Wed, 8/3/11, Dan Stromberg <drsalists@gmail.com>
wrote:
From: Dan Stromberg <drsalists@gmail.com>
Subject: [TUHS] /usr/bin on V7?
To: tuhs@minnie.tuhs.org
Date: Wednesday, August 3, 2011, 7:53 PM
When I boot V7 in SIMH (pdp11), I get a root shell and a root filesystem, but... I see that /usr/bin is on root's default PATH, but I have no /usr/bin directory. Is there some way I could get a /usr/bin with additional executables, to get the full flavor of V7?
By way of introduction, I first started with *ix on an AT&T 3Bmumble, and started really getting into it with SunOS 4.1.1. I've recently become interested in trying a large number of different *ix's - I guess it was the ease with which VirtualBox allowed many of those, and then seeing Nordier's V7 port to x86 got me curious about trying some really old versions - he mentioned that there was a pdp11 emulator available...
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