Hi,
On Sat, 05 Dec 2015 08:03:32 +0900,
Nicholas Bamber wrote:
> It is not releveant how this works in other shells (or even other
> versions of ksh). All that matters is whether this syntax is defined by the
> POSIX standard. It's not even documented as a bash feature let alone a POSIX
> standard.
The POSIX standard defines ${parameter+word} behavior:
http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_02
and old ksh 93s+20080202-1 (Debian jessie, squeeze) behaves
as I and POSIX standard expected.
> It may be of interest to you to be reminded that this version of ksh is
> dead upstream, so even if I agreed it really was a problem it is very
> possible the most I would do is tag it confirmed.
>
> As it is I believe you are trying to use an undocumented syntax that
> just happens to do something you like in lots of other shells. I would
> however be interested to know what YOU think the "${v+set}" syntax should do.
No. I use the documented syntax.
Regards,
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