From: Mikael Magnusson <mikachu@gmail.com>
To: ZyX <kp-pav@yandex.ru>
Cc: Dmitri Vereshchagin <dmitri.vereshchagin@gmail.com>,
Zsh Users <zsh-users@zsh.org>
Subject: Re: question about parameter expansion
Date: Sat, 26 Sep 2015 19:57:23 +0200 [thread overview]
Message-ID: <CAHYJk3STx4m2ySAsBRjP2Dr_7HXEuiRr05sb6UT+TszsE3VgPg@mail.gmail.com> (raw)
In-Reply-To: <187221443289280@web15m.yandex.ru>
On Sat, Sep 26, 2015 at 7:41 PM, ZyX <kp-pav@yandex.ru> wrote:
> 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}
>
> ?
The main reason would be that it doesn't do what OP asked for.
--
Mikael Magnusson
next prev parent reply other threads:[~2015-09-26 17:57 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
2015-09-26 17:57 ` Mikael Magnusson [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAHYJk3STx4m2ySAsBRjP2Dr_7HXEuiRr05sb6UT+TszsE3VgPg@mail.gmail.com \
--to=mikachu@gmail.com \
--cc=dmitri.vereshchagin@gmail.com \
--cc=kp-pav@yandex.ru \
--cc=zsh-users@zsh.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/zsh/
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).