From: crossd@gmail.com (Dan Cross)
Subject: [TUHS] Shell control through external commands
Date: Sun, 11 Sep 2016 14:27:48 -0400 [thread overview]
Message-ID: <CAEoi9W62QMprW=AqXJ4aJuwxKnjydWfUgEpr7bRBQsWoc-gtkw@mail.gmail.com> (raw)
In-Reply-To: <201609111739.u8BHd2pV146715@tahoe.cs.Dartmouth.EDU>
On Sun, Sep 11, 2016 at 1:39 PM, Doug McIlroy <doug at cs.dartmouth.edu> wrote:
> > IIRC #! originated at Bell Labs but it got out to the world via BSD.
> > Perhaps Dr. McIlroy could confirm / deny / expand upon the details
> (please?)
>
> I recall Dennis discussing the feature at some length before installing it.
> So the exact semantics, especially the injected argument, are almost]
> certainly his. I don't know whether he built on a model from elsewhere.
> #! appeared between v7 (1979) and v8 (1985). As v8 was never released,
> it clearly made its way into the world via BSD and USG. BSD, being
> more nimble, was likely first.
>
Also, 8th edition was essentially a re-port of 4.1c BSD, correct? If it
were already in BSD, it could conceivably come back into 8th edition via
that route. I found the following in /usr/src/sys/sys/TODO for 4.0BSD:
6. Exec fixes
> Implement dmr's #! feature; pass string arguments through faster.
That would strongly imply that the feature originated with Dennis and was
known in Berkeley around the time for 4BSD.
4.0's 'getxfile()' in /usr/src/sys/sys/sys1.c does not recognize the '#!'
sequence as a magic number, but 'exece()' in /usr/src/sys/newsys/sys1.c
does. No mention of it came up in my cursory scan of 3bsd. So it was
certain present by the time of 4.1c, but not before 4BSD that I found.
- Dan C.
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next prev parent reply other threads:[~2016-09-11 18:27 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-11 17:39 Doug McIlroy
2016-09-11 18:11 ` Clem Cole
2016-09-11 18:27 ` Dan Cross [this message]
2016-09-11 18:50 ` Sven Mascheck
2016-09-11 22:13 ` Random832
-- strict thread matches above, loose matches on Subject: below --
2016-09-12 12:57 Norman Wilson
2016-09-12 12:56 Norman Wilson
2016-09-12 1:43 Norman Wilson
2016-09-12 9:18 ` Joerg Schilling
2016-09-12 1:31 Norman Wilson
2016-09-12 9:33 ` Joerg Schilling
2016-09-12 0:27 Doug McIlroy
2016-09-10 14:57 Nemo
2016-07-15 16:47 Doug McIlroy
2016-09-10 17:40 ` Dario Niedermann
2016-09-10 19:22 ` arnold
2016-09-12 8:35 ` markus schnalke
2016-09-12 9:25 ` Joerg Schilling
2016-09-12 12:41 ` Tony Finch
2016-09-12 12:50 ` Joerg Schilling
2016-09-13 0:17 ` Sven Mascheck
2016-09-13 1:45 ` Sven Mascheck
2016-09-13 9:20 ` Joerg Schilling
2016-09-12 20:12 ` Dave Horsfall
2016-09-12 21:36 ` Dave Horsfall
2016-09-10 22:43 ` Dave Horsfall
2016-09-11 1:24 ` Ron Natalie
2016-09-11 2:39 ` arnold
2016-09-11 2:41 ` Ronald Natalie
2016-09-11 4:07 ` Dave Horsfall
2016-09-11 5:01 ` arnold
2016-09-12 5:49 ` Dave Horsfall
2016-07-15 12:27 Norman Wilson
2016-09-10 7:45 ` Dario Niedermann
2016-09-10 9:13 ` Michael Kjörling
2016-09-10 9:41 ` Joerg Schilling
2016-09-10 17:06 ` Random832
2016-09-10 17:45 ` Dario Niedermann
2016-09-10 19:53 ` Dan Cross
2016-09-10 20:02 ` Chet Ramey
2016-09-10 20:27 ` Dario Niedermann
2016-09-11 10:03 ` Diomidis Spinellis
2016-09-12 10:05 ` Jacob Goense
2016-07-15 4:29 Rudi Blom
2016-07-14 13:18 Diomidis Spinellis
2016-07-14 13:23 ` Clem Cole
2016-07-14 14:12 ` Mary Ann Horton
2016-07-14 22:36 ` Dave Horsfall
2016-07-14 22:47 ` Corey Lindsly
2016-07-14 22:49 ` Peter Jeremy
2016-07-14 23:27 ` Marc Rochkind
2016-07-15 10:13 ` Joerg Schilling
[not found] ` <CAH_OBieVFzPn93L8=_fmbUycZ7UmYdXiopC0vgei6RGDZp0mHw@mail.gmail.com>
[not found] ` <CAH_OBie_6gFy+BqkCMj+sr0NqTMNOQxvgWf6SQnHMJpn7DAytA@mail.gmail.com>
2016-07-14 23:56 ` shawn wilson
2016-07-15 1:04 ` Dave Horsfall
2016-07-15 1:22 ` Steve Nickolas
2016-07-15 2:25 ` arnold
2016-07-16 6:26 ` Dave Horsfall
2016-07-15 2:25 ` Random832
2016-07-15 3:59 ` Dave Horsfall
2016-07-15 4:09 ` Random832
2016-07-15 13:55 ` Chet Ramey
2016-07-14 23:10 ` Ronald Natalie
2016-07-15 1:41 ` Nemo
2016-07-15 9:00 ` Tony Finch
2016-07-14 14:11 ` schoedel
2016-07-14 14:38 ` Diomidis Spinellis
2016-07-14 15:46 ` John Cowan
2016-07-14 16:30 ` Random832
2016-07-14 22:32 ` Dave Horsfall
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