I've used unattended and scheduled updates via root cron and am looking to perform updates on a larger scale (using command line: non gui).
Ideally it would download the updates from the repositories once and share a local copy of the updates amongst the machines.
How to keep an office or cluster of machines up to date in a download efficient manner?
sudo apt-get upgrade; sudo apt-get upgrade
on all the systems. – muru Dec 04 '16 at 08:05