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Re: ${var:+foo "$empty"}

From: Chet Ramey
Subject: Re: ${var:+foo "$empty"}
Date: Sun, 23 Jan 2005 13:16:32 -0500
User-agent: Mozilla Thunderbird 0.9 (Windows/20041103)

Stephane Chazelas wrote:

$ bash -c 'printf "<%s>\n" ${$:+a "$a"}'
$ ksh -c 'printf "<%s>\n" ${$:+a "$a"}'
$ dash -c 'printf "<%s>\n" ${$:+a "$a"}'

I believe that bash is right.  Posix says explicitly that the word
on the rhs of the `+' does not undergo word splitting when it is
used.  I do not believe that Posix intended word splitting to be
performed on the result.

"$@" is the only expansion that's allowed to result in multiple
words.  And the way shells have behaved historically means that
"$@" anywhere in a word enables the `special $@ mode' handling.


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