From: Martijn Dekker <martijn@inlv.org>
To: zsh-users@zsh.org
Cc: Ryan Wilson <ryan@enosys.org>
Subject: Re: [bug] () { echo $#} $'' is zero
Date: Thu, 03 Mar 2016 23:33:21 +0100 [thread overview]
Message-ID: <56D8BBB1.4030608@inlv.org> (raw)
In-Reply-To: <1533e4d3e82.cbf3800a134118.3897690426664036468@enosys.org>
Ryan Wilson schreef op 03-03-16 om 22:16:
> Subject says it all. The empty string $'' is not passed to commands the same
> way the empty strings "" and '' are:
[...]
> Any clue as to what's going on?
Apparently, zsh subjects $'' to empty removal[*] as if it were an
unquoted parameter substitution for an empty variable.
This form of quoting is not standardised yet, but this behaviour is
unlike bash, ksh93, mksh and FreeBSD /bin/sh, so I would agree it's a
bug in zsh.
C-style escape $'quoting' looks likely to be added to the next edition
of the POSIX standard (with FreeBSD /bin/sh recently adding support for
it), so now would be a particularly good time to fix it.
- M.
[*] POSIX: "If the complete expansion appropriate for a word results in
an empty field, that empty field shall be deleted from the list of
fields that form the completely expanded command, unless the original
word contained single-quote or double-quote characters."
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06
next prev parent reply other threads:[~2016-03-03 22:59 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-03 21:16 Ryan Wilson
2016-03-03 22:33 ` Martijn Dekker [this message]
2016-03-03 23:34 ` Bart Schaefer
2016-03-04 7:16 ` Philippe Troin
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=56D8BBB1.4030608@inlv.org \
--to=martijn@inlv.org \
--cc=ryan@enosys.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).