[OT] Issue with a Mac Shell script

Hi all,

I'm trying to code a Unix script in order to eject a RAM Disk.

Using:

diskutil list | grep 'RAM Disk' | awk '{print $6}'

I'm able to get the disk ref (i.e. Disk1).

But trying:

diskutil eject |diskutil list | grep 'RAM Disk' | awk '{print $6}'

I can't achieve what I need.

Maybe, I should use a variable, but I don't know how to assign diskutil 
list | grep 'RAM Disk' | awk '{print $6}' to a variable.

TIA for any help.

-- 
Jean-Luc Arnaud