From: Ray Andrews <rayandrews@eastlink.ca>
To: "Lawrence Velázquez" <larryv@macports.org>
Cc: zsh-users@zsh.org
Subject: Re: surprise with echo
Date: Fri, 19 Dec 2014 21:37:06 -0800 [thread overview]
Message-ID: <54950B02.3010907@eastlink.ca> (raw)
In-Reply-To: <B5AFD6F7-6A0F-4193-9732-CA3D0884B825@macports.org>
On 12/19/2014 09:08 PM, Lawrence Velázquez wrote:
> You still don't understand what's going on. The expansion only results
> in a null result *if the array itself is empty*. Null *elements* do
> not produce the same behavior.
Yes, I understand it, I just spoke poorly.
> Agreed. That's why enabling RC_EXPAND_PARAM by default should never
> happen.
I'd say that if it worked the way Kurtis showed that it's 'supposed' to work
then that would be the best of all possible worlds. But it's just my 1/2
cent, I don't value my own opinion on this beyond that.
>> OTOH Bart just showed how the surprise can be avoided so ....
> It's only a surprise if you enable the option without understanding
what it does first.
Too true.
>clang -I${include_dirs} test.c What would be the point of this
expanding to "clang -I test.c"? It seems entirely reasonable to drop
that word entirely and expand to "clang test.c", which is what actually
happens. vq
Well, whatever more experienced people think. I have no skin in the
issue, but my intuitive sense of it is than a 'nothing' should just be
nothing, but it shouldn't go killing things that are not nothing. It's
probably not debatable, and it doesn't matter anyway. Especially if
there are other examples of that sort of thing, then it might not be
considered a surprise. But if that's the only place where it happens,
then I'd say it's questionable. That expansion is sure cool, but I don't
think it should kill entire strings: echo "what's wrong with this
string? $@", especially since it leaves it alone if we use " $* ".
Dunno. All I can say is that rc itself seems to agree with me.
next prev parent reply other threads:[~2014-12-20 5:37 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-19 1:24 Ray Andrews
2014-12-19 3:06 ` Bart Schaefer
2014-12-19 3:20 ` Lawrence Velázquez
2014-12-19 6:09 ` Ray Andrews
2014-12-19 6:30 ` Kurtis Rader
2014-12-19 17:54 ` Ray Andrews
2014-12-19 4:14 ` Kurtis Rader
2014-12-19 4:39 ` Lawrence Velázquez
2014-12-19 5:19 ` Kurtis Rader
2014-12-19 6:00 ` Lawrence Velázquez
2014-12-19 5:57 ` Bart Schaefer
2014-12-19 6:08 ` Kurtis Rader
2014-12-19 6:58 ` Ray Andrews
2014-12-20 2:55 ` Bart Schaefer
2014-12-20 3:05 ` Kurtis Rader
2014-12-20 3:49 ` Ray Andrews
2014-12-20 4:40 ` Bart Schaefer
2014-12-20 5:50 ` Ray Andrews
2014-12-19 6:45 ` Ray Andrews
2014-12-19 11:21 ` Oliver Kiddle
2014-12-20 2:09 ` Bart Schaefer
2014-12-20 2:58 ` Kurtis Rader
2014-12-20 3:55 ` Ray Andrews
2014-12-20 5:08 ` Lawrence Velázquez
2014-12-20 5:37 ` Ray Andrews [this message]
2014-12-20 9:45 ` ZyX
2014-12-19 6:00 ` Ray Andrews
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=54950B02.3010907@eastlink.ca \
--to=rayandrews@eastlink.ca \
--cc=larryv@macports.org \
--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).