Re: How to do? Possible?

[Dennis Williamson]

On Mon, Jul 25, 2011 at 4:45 PM, Linda Walsh <bash@tlinx.org> 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.

-- 
Visit serverfault.com to get your system administration questions answered.