From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: zsh-workers@zsh.org
Subject: Re: '>>' does not create file if set -C (noclobber) is active
Date: Thu, 25 Jun 2015 15:04:32 +0100 [thread overview]
Message-ID: <20150625140432.GD19558@chaz.gmail.com> (raw)
In-Reply-To: <150625003047.ZM19218@torch.brasslantern.com>
2015-06-25 00:30:47 -0700, Bart Schaefer:
> On Jun 25, 4:22am, Martijn Dekker wrote:
> } Subject: Re: '>>' does not create file if set -C (noclobber) is active
> }
> } > The noclobber option is an extension, and has nothing whatsoever to do
> } > with POSIX.
> }
> } That is not correct.
>
> Well, damn. When did they do that?
>
> As far as I know, this was first implemented in zsh and has worked as it
> does in zsh since around 1990 -- there is no mention of the -C option in
> the ksh88 manual, for example. So I'm still inclined to say that this
> is just not going to change, because we'd either have to (1) change it in
> native mode or (2) do one of those hacks that tests the emulation mode
> so it only works if you actually start the shell that way or (3) add an
> entirely new setopt just for this. I don't like any of those choices.
Though that's initially a csh feature (from the start: 1979),
AFAIK, noclobber has always been in ksh. But the -C alias may
have been added in ksh93 and retrofitted to ksh88. The ksh88a
(http://www.in-ulm.de/~mascheck/various/shells/ksh88-fixes)
release notes mention noclobber. The ksh93 release notes mention
adding -C as an alias for noclobber.
The original pdksh didn't have either. I don't know when they
were added.
It was added to bash in January 1990 but first as a variable.
1.12 (Dec 1991) had it as both set -C and set -o noclobber.
I suspect both were already in POSIX.2. It was added to ash in
4.4BSD-Alpha (1992):
http://www.in-ulm.de/~mascheck/various/ash/index.html#44bsdalpha
I don't think it was ever added to the Bourne shell though.
--
Stephane
next prev parent reply other threads:[~2015-06-25 14:05 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-25 1:02 Martijn Dekker
2015-06-25 1:49 ` Bart Schaefer
2015-06-25 2:22 ` Martijn Dekker
2015-06-25 7:30 ` Bart Schaefer
2015-06-25 14:04 ` Stephane Chazelas [this message]
2015-06-25 16:00 ` Bart Schaefer
2015-06-25 19:20 ` Chet Ramey
2015-06-26 14:14 ` Martijn Dekker
2015-06-26 20:15 ` Bart Schaefer
2015-06-27 1:54 ` Martijn Dekker
2015-06-27 3:38 ` Bart Schaefer
2015-06-27 17:02 ` Peter Stephenson
2015-06-28 0:02 ` Martijn Dekker
2015-06-28 0:46 ` Martijn Dekker
2015-06-28 7:48 ` Stephane Chazelas
2015-06-28 9:15 ` Oliver Kiddle
2015-06-28 14:00 ` Stephane Chazelas
2015-06-28 18:38 ` Bart Schaefer
2015-06-28 19:30 ` Stephane Chazelas
2015-07-23 2:56 ` PATCH: sysopen (was Re: '>>' does not create file if set -C (noclobber) is active) Oliver Kiddle
2015-07-24 10:57 ` Peter Stephenson
2015-07-24 11:55 ` Peter Stephenson
2015-07-30 11:05 ` Mikael Magnusson
2015-07-31 12:41 ` Oliver Kiddle
2015-07-31 14:02 ` Mikael Magnusson
2015-06-28 17:19 ` '>>' does not create file if set -C (noclobber) is active Peter Stephenson
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