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From: | Eric Blake |
Subject: | Re: difference between ${1+"$@"} and "$@"? |
Date: | Thu, 26 Aug 2010 10:28:32 -0600 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.8) Gecko/20100806 Fedora/3.1.2-1.fc13 Mnenhy/0.8.3 Thunderbird/3.1.2 |
On 08/26/2010 10:20 AM, Greg Wooledge wrote:
On Thu, Aug 26, 2010 at 11:13:21AM -0500, E R wrote:With bash is there any difference between the expressions ${1+"$@"} and "$@"?No.Is there any difference with other sh-like shells?In some Bourne shells, "$@" with an empty set of positional parameters may expand to a single empty words, instead of no words at all. Hence the ${1+"$@"} workaround for ancient shells.
Versions of zsh were the most recently afflicted by this, although it has been fixed there for several years now.
-- Eric Blake eblake@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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