If these are supposed to be Centos pkgs, using the yum cmd, then use ssh to run the cmd remotely like
http://malcontentcomics.com/systemsb...s-via-ssh.html.
In your case, the remote cmd would start
Code:
yum -y pkg1 pkg2 ...
You can loop the linked example to hit all 20 systems, using ssh auth keys ideally.
This will make it work without user interaction.