Keep all Linux installation up-to-date

I don’t run auto-update for all those machines, so I have to run these every couple of days:

ssh -t ubuntu “sudo apt-get update && sudo apt-get -y dist-upgrade”
ssh -t debian “sudo apt-get update && sudo apt-get -y dist-upgrade”
ssh -t fedora “sudo yum -y update”
ssh -t centos “sudo yum -y update”
ssh -t opensuse “sudo zypper -n update ”
ssh -t mandriva “sudo urpmi –auto-update –auto-orphans –force”