From: Bart Schaefer <schaefer@brasslantern.com>
To: zsh-users@zsh.org
Subject: Re: `[[ -n $VAR ]]` equal to `[[ $VAR ]]`?
Date: Thu, 9 Apr 2015 19:01:51 -0700 [thread overview]
Message-ID: <150409190151.ZM25540@torch.brasslantern.com> (raw)
In-Reply-To: <mg78mg$vqb$1@ger.gmane.org>
On Apr 10, 3:23am, Thorsten Kampe wrote:
} Subject: `[[ -n $VAR ]]` equal to `[[ $VAR ]]`?
}
} this is kind of a follow-up to
} http://www.zsh.org/mla/users/2011/msg00284.html .
Note 2011.
} Now my question is, isn't `[[ -n $VAR ]]` equivalent to `[[ $VAR ]]`?
} (`[[ -n ${VAR+stuff} ]]` equivalent to `[[ ${VAR+stuff} ]]`)
The answer is zsh-version-dependent.
In all releases prior to May 2014, [[ $var ]] was a parse error. In all
later releases, [[ $var ]] is the same as [[ -n $var ]]. That means
zsh 5.0.6 and later support the bash-equivalent syntax.
prev parent reply other threads:[~2015-04-10 2:02 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-10 1:23 Thorsten Kampe
2015-04-10 1:31 ` Kurtis Rader
2015-04-10 1:39 ` Thorsten Kampe
2015-04-10 2:02 ` Kurtis Rader
2015-04-10 2:05 ` Kurtis Rader
2015-04-10 2:46 ` Mikael Magnusson
2015-04-10 2:59 ` Kurtis Rader
2015-04-10 4:00 ` Mikael Magnusson
2015-04-10 6:06 ` Thorsten Kampe
2015-04-13 16:52 ` Ray Andrews
2015-04-13 17:36 ` Roman Neuhauser
2015-04-13 23:58 ` Ray Andrews
2015-04-14 1:27 ` Bart Schaefer
2015-04-14 15:06 ` Ray Andrews
2015-04-10 3:21 ` Kurtis Rader
2015-04-10 2:01 ` Bart Schaefer [this message]
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=150409190151.ZM25540@torch.brasslantern.com \
--to=schaefer@brasslantern.com \
--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).