On Mon, Jul 25, 2011 at 4:45 PM, Linda Walsh <[email protected]> wrote:
>
>
> Linda Walsh wrote:
>>
>> Bob Proulx wrote:
>>> Yes, but it is a fork(2) of the parent shell and all of the variables
>>> from the parent are copied along with the fork into the child process
>>> and that includes non-exported variables. Normally you would expect
>>> that a subprocess wouldn't have access to parent shell variables
>>> unless they were exported. But with a subshell a copy of all
>>> variables are available.
>>>
>>> Bob
>> --
>> Not really.
>> It only seems that way because within () any "$xxxx" is usually
>> expanded BEFORE the () starts from the parent....
>>
>> You can see this by
>> GLOBAL="hi there"
>> (echo $GLOBAL)
>> prints out "hi there" as expected, but if we hide
>> $GLOBAL so it isn't seen by parent:
>> (foo=GLOBAL; echo ${!foo})
>> prints ""
> ---
> I mistyped that but it brings me to an interesting
> conundrum:
>
> GLOBAL="hi there"
> {foo=GLOBAL echo ${!foo}; }
>
>> (foo=GLOBAL echo ${!foo} )
>
> But:
>> { foo=GLOBAL;echo ${!foo}; }
> hi there
>> (foo=GLOBAL; echo ${!foo})
> hi there
> ----
> Weird...
>
>
>
I'm assuming you meant:
GLOBAL="hi there"
{foo=$GLOBAL echo ${!foo}; }
You had a missing dollar sign.
--
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