Creating an extended partition for whole disk size... automaticly

[Bas Rijniersce]

Hello,

I just started with parted. I'm using it to create a "Restore cd". I would like 
to setup an extended partition for the whole disk size, from a script.

Now I have to give start and end position in MB. It would we nice to be able to 
use a special keyword like $END to get the end size you also see when you 
use "print"

I'll probably create a script that parses the output of parted < "echo print" 
or something like that. But it would be nice to do that automaticly

Another nice thing would be a special character that will make parted ignore 
the following line. In my case, i'm using a script for parted:
# Boot partition, 128M
mkpartfs primary linux-swap 0 128

The hash now isn't reconized as a command and the help is shown. 

Any suggestions / solutions are welcome :-)

With kind regards,
Bas Rijniersce