From: Martijn Dekker <martijn@inlv.org>
To: zsh-workers@zsh.org
Subject: Re: Arith parsing bug with minus after $#
Date: Fri, 29 May 2015 17:43:54 +0200 [thread overview]
Message-ID: <5568893A.2070701@inlv.org> (raw)
In-Reply-To: <20150529160237.6f329071@pwslap01u.europe.root.pri>
Peter Stephenson schreef op 29-05-15 om 17:02:
> On Thu, 28 May 2015 21:42:41 +0200
> Martijn Dekker <martijn@inlv.org> wrote:
>> % set --
>> % echo $#
>> 0
>> % echo $(($#-1))
>> 41
>
> That's not a compatibility issue, that's just plain weird. I don't know
> the POSIX terminology.
>
> The problem is the overloading of "#" --- the test to establish what to
> do with it is trying too hard to resolve to ${#-}, which is a valid
> substitution, because it hasn't taken into account that there are no
> braces. So what you're seeing is ${#-}1.
Ah, yes... ${#-} is the length in characters of $-, the shell options
that are set. Before 'emulate sh', the length of $- is 8, and after,
it's 4. That explains the results I got.
The fix is working; thanks yet again.
- M.
next prev parent reply other threads:[~2015-05-29 15:44 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-28 19:42 Martijn Dekker
2015-05-29 15:02 ` Peter Stephenson
2015-05-29 15:43 ` Martijn Dekker [this message]
2015-05-29 18:09 ` Bart Schaefer
2015-05-29 19:33 ` Martijn Dekker
2015-05-29 20:48 ` ZyX
2015-05-29 21:24 ` Bart Schaefer
2015-05-30 19:24 ` Peter Stephenson
2015-05-30 19:40 ` Peter Stephenson
2015-05-30 22:28 ` Bart Schaefer
2015-05-30 23:30 ` Peter Stephenson
2015-06-07 1:08 ` Bart Schaefer
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