On Mon, Feb 16, 2009 at 11:44 AM, Paul Jarc <p...@po.cwru.edu> wrote:
> Jon Seymour <jon.seym...@gmail.com> wrote:
>> On Mon, Feb 16, 2009 at 10:22 AM, Paul Jarc <p...@po.cwru.edu> wrote:
>>> CPATH=${CPATH:+$CPATH:}${#+~usr1/blah/blah}
>>
>> Out of interest, how does one derive that outcome from the documented
>> behaviour of bash? That is, which expansion rules are being invoked?
>
> It's ${parameter+word}, using $# (which is always set) as the
> parameter.
The manual specifies a rule for ${parameter:+word}, but not
${parameter+word}. Is the : sugar which can be ignored under some
circumstances?
jon.
>
>
> paul
>
