From: arnold@skeeve.com (arnold@skeeve.com)
Subject: [TUHS] environments/universes (was: Unix v6 problem with /tmp)
Date: Thu, 28 Jul 2016 21:05:05 -0600 [thread overview]
Message-ID: <201607290305.u6T355aq009962@freefriends.org> (raw)
In-Reply-To: <20160728231639.GA299581@lisa.in-ulm.de>
Sven Mascheck <mascheck at in-ulm.de> wrote:
> Sequent Dynix "universes" (idea picked up by Siemens Sinix) puts several
> targets in one symlink. Example:
>
> ln -c ucb=.bin att=/usr/att/bin /bin
>
> and the actual resolving (and usage of different default PATHs)
> is controlled by an environment variable, as far as I know
> (s.a. http://www.in-ulm.de/~mascheck/various/universes/)
Pyramid did something similar, also called universes, in the mid-80s.
I think they used a system call and corresponding command to set
the visible universe either to BSD or System V. I don't remember the
details as to how exactly it worked.
I *think* this was before Dynix, but I'm not sure.
We had a Pyramid when I was working at Georgia Tech. DMR visited one time
and spoke; I remember him saying that he thought what Pyramid had done
was an awful idea... :-) (They were interesting machines. It was RISC,
with loadable microcode... About the same speed as a Vax 780 but half
the price.)
Arnold
next prev parent reply other threads:[~2016-07-29 3:05 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-27 20:28 [TUHS] Unix v6 problem with /tmp Mark Longridge
2016-07-27 20:31 ` William Pechter
2016-07-27 20:57 ` Clem Cole
2016-07-27 21:01 ` Clem Cole
2016-07-27 21:10 ` William Pechter
2016-07-28 0:49 ` Clem cole
2016-07-28 1:03 ` William Pechter
2016-07-28 11:23 ` [TUHS] History repeating itself (was: Unix v6 problem with /tmp) Michael Kjörling
2016-07-28 12:18 ` Tony Finch
2016-07-28 13:57 ` John Cowan
2016-07-30 7:56 ` Greg 'groggy' Lehey
2016-07-30 11:41 ` William Cheswick
2016-07-30 23:28 ` Greg 'groggy' Lehey
2016-07-30 23:50 ` scj
2016-08-01 11:36 ` Tony Finch
2016-07-30 14:15 ` John Cowan
2016-07-30 15:30 ` [TUHS] History repeating itself Michael Kjörling
2016-07-28 1:03 ` [TUHS] Unix v6 problem with /tmp Clem cole
2016-07-28 23:16 ` [TUHS] environments/universes (was: Unix v6 problem with /tmp) Sven Mascheck
2016-07-29 3:05 ` arnold [this message]
2016-07-29 14:14 ` Clem Cole
2016-07-29 13:55 ` Clem Cole
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