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Re: difference between ${1+"$@"} and "$@"?


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   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org



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