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Nice. For OS X users, iTerm/iTerm2 "Send Input to All Tabs" mode (⌘-I) is another way to go about that.

Terminator (http://www.tenshu.net/terminator/ - not to be confused with http://software.jessies.org/terminator/) can group terms similarly on systems with gtk.

For linux users this is the equivalent: https://github.com/duncs/clusterssh