Quite frequently I need to do the same configuration steps on several machines. This can get really cumbersome if you do one machine after the other. However there is a cool tool, which let's you execute the commands on several machines simulataneously - ClusterSSH.
On Debian/Ubuntu you can install it using
# apt-get install clusterssh
Now you can either create a cluster file, which helps to administrate the same machines on different occasions, or you just run
# cssh username@machine1 username@machine2
to work on two machines simultaneously.
Additional infos can be found here
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