From: ZyX <kp-pav@yandex.ru>
To: Mikael Magnusson <mikachu@gmail.com>,
Dmitri Vereshchagin <dmitri.vereshchagin@gmail.com>
Cc: Zsh Users <zsh-users@zsh.org>
Subject: Re: question about parameter expansion
Date: Sat, 26 Sep 2015 20:41:20 +0300 [thread overview]
Message-ID: <187221443289280@web15m.yandex.ru> (raw)
In-Reply-To: <CAHYJk3QegiGeqwiw834TVW+tFzvW5+HKV0cvopDyxOJnrZ6LYQ@mail.gmail.com>
26.09.2015, 16:38, "Mikael Magnusson" <mikachu@gmail.com>:
> On Sat, Sep 26, 2015 at 12:18 PM, Dmitri Vereshchagin
> <dmitri.vereshchagin@gmail.com> wrote:
>> Hello.
>>
>> Here is a code sample I would like to rewrite using parameter expansion
>>
>> if (( ${+foo} )); then
>> bar=
>> else
>> bar=baz
>> fi
>>
>> Cannot find it in the docs, but I suppose there is a way to do that. Am
>> I right?
>>
>> Thanks.
>>
>> --
>> Dmitri Vereshchagin
>
> You have to think outside the box for this one,
> bar=${${${+foo}#1}//0/baz}
Why not simply
bar=${foo+baz}
?
>
> --
> Mikael Magnusson
next prev parent reply other threads:[~2015-09-26 17:47 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-26 10:18 Dmitri Vereshchagin
2015-09-26 13:37 ` Mikael Magnusson
2015-09-26 17:41 ` ZyX [this message]
2015-09-26 17:57 ` Mikael Magnusson
2015-09-26 18:08 ` Dmitri Vereshchagin
2015-09-26 18:33 ` Mikael Magnusson
2015-09-26 18:57 ` Dmitri Vereshchagin
2015-09-26 21:11 ` Ray Andrews
2015-09-26 21:34 ` Bart Schaefer
2015-09-26 22:02 ` Ray Andrews
2015-09-27 16:58 ` Bart Schaefer
2015-09-27 18:29 ` Ray Andrews
2015-09-27 18:43 ` ZyX
2015-10-02 14:10 ` Simon Ruderich
2015-10-02 16:35 ` Ray Andrews
2015-10-02 19:07 ` Simon Ruderich
2015-10-02 19:50 ` Ray Andrews
2015-10-02 20:03 ` latest manual Ray Andrews
2015-10-02 20:23 ` Ray Andrews
2015-10-02 20:53 ` Bart Schaefer
2015-10-02 21:55 ` Ray Andrews
2015-10-03 18:49 ` Bart Schaefer
2015-10-03 10:01 ` Simon Ruderich
2015-10-02 20:58 ` Andrew Janke
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