From: Bart Schaefer <schaefer@brasslantern.com>
To: Felipe Contreras <felipe.contreras@gmail.com>
Cc: Roman Perepelitsa <roman.perepelitsa@gmail.com>,
Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: Bug with unset variables
Date: Wed, 11 Nov 2020 10:36:19 -0800 [thread overview]
Message-ID: <CAH+w=7ZXojQV+fAwrRdCVcWzrnza9HRio7G0342X3sBs=Rh8rw@mail.gmail.com> (raw)
In-Reply-To: <CAMP44s3s3CWX0b-hxFTb8tWM3HasHngY1Spg_8V6jWErSLTOEA@mail.gmail.com>
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On Wed, Nov 11, 2020 at 10:04 AM Felipe Contreras <
felipe.contreras@gmail.com> wrote:
>
> And what is the reason why this is not the default?
>
Remember that doc Daniel quoted?
30 years-ish ago, when implementing zsh as a new shell from scratch, that
documentation was used to decide the behavior. At that point the other
shells that supported "typeset" were not freeware -- they required
expensive licenses or were bundled with commercial operating systems. So
the implementation followed the doc (sometimes, it followed a
misunderstanding of the doc, which is why for example zsh syntax to specify
integer bases differs from ksh) without examples to which to compare.
Zsh development has always followed a principle of NOT arbitrarily breaking
past usage without an extremely good reason (something I wish other APIs
would have taken to heart over the years ... IMO there would be much less
abandonware sitting in metaphorical dustbins ... but I digress). So by the
time anyone noticed, the behavior you see now was standard practice for zsh
in its default modes.
Your original example can use ${var:-other} if empty string has no explicit
meaning in context.
Either way, if "emulate ksh" is supposed to emulate ksh, then it's not
> working properly in this instance.
>
Despite the name, "emulate ksh" is not supposed to perfectly emulate ksh.
All it does is change the values of "setopt" to match ksh as closely as
possible. A more complete emulation is achieved by actually starting zsh
from a symlink named "ksh" (or one of a few equivalent ways). Same goes
for "sh" and "bash" (although there is little difference for those two).
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next prev parent reply other threads:[~2020-11-11 18:36 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-11 15:57 Felipe Contreras
2020-11-11 16:13 ` Roman Perepelitsa
2020-11-11 16:56 ` Felipe Contreras
2020-11-11 17:02 ` Roman Perepelitsa
2020-11-11 18:03 ` Felipe Contreras
2020-11-11 18:16 ` Roman Perepelitsa
2020-11-11 20:42 ` Felipe Contreras
2020-11-12 0:20 ` Mikael Magnusson
2020-11-12 1:10 ` Felipe Contreras
2020-11-12 8:45 ` Roman Perepelitsa
2020-11-12 10:47 ` Peter Stephenson
2020-11-12 18:48 ` Bart Schaefer
2020-11-12 19:49 ` Felipe Contreras
2020-11-12 18:46 ` Felipe Contreras
2020-11-12 19:10 ` Roman Perepelitsa
2020-11-12 21:08 ` Felipe Contreras
2020-11-13 8:51 ` Roman Perepelitsa
2020-11-14 0:52 ` Felipe Contreras
2020-11-14 5:41 ` Roman Perepelitsa
2020-11-16 19:41 ` Felipe Contreras
2020-11-16 20:22 ` Roman Perepelitsa
2020-11-17 20:28 ` Felipe Contreras
2020-11-18 22:45 ` Daniel Shahaf
2020-11-22 1:20 ` Felipe Contreras
2020-11-23 4:00 ` Daniel Shahaf
2020-11-23 6:18 ` Felipe Contreras
2020-11-19 2:59 ` Bart Schaefer
2020-11-22 1:50 ` Felipe Contreras
2020-11-17 20:54 ` Bart Schaefer
2020-11-22 1:49 ` Felipe Contreras
2020-11-23 6:48 ` Bart Schaefer
2020-11-23 7:26 ` Felipe Contreras
2020-11-23 20:26 ` Bart Schaefer
2020-11-23 23:39 ` Felipe Contreras
2020-11-24 0:52 ` Bart Schaefer
2020-11-25 8:46 ` Felipe Contreras
2020-11-27 15:44 ` Daniel Shahaf
2020-11-27 20:49 ` Felipe Contreras
2020-11-27 20:59 ` Daniel Shahaf
2020-11-27 21:33 ` Bart Schaefer
2020-11-27 23:37 ` Daniel Shahaf
2020-11-27 23:45 ` Bart Schaefer
2020-11-28 0:24 ` Bart Schaefer
2020-11-28 7:32 ` Bart Schaefer
2020-11-28 12:05 ` Felipe Contreras
2020-11-12 19:26 ` Bart Schaefer
2020-11-12 21:48 ` Felipe Contreras
2020-11-13 22:17 ` Bart Schaefer
2020-11-14 0:58 ` Felipe Contreras
2020-11-11 18:36 ` Bart Schaefer [this message]
2020-11-11 21:08 ` Felipe Contreras
2020-11-11 17:02 ` Peter Stephenson
2020-11-11 18:05 ` Felipe Contreras
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