parallel ssh
pssh and consors are usefull if you administrate a huge number of *nix boxes.
But adding hundred of fingerprints on your ~/.ssh/known_hosts file may take some time.
On a trusted network, here how to bypass this, by using SSH option :
add SSH option (-O) “StrictHostKeyCheckin=no” to the pssh, pscp, pslurp… command
e.g :
pssh -P -h machines.list -O=StrictHostKeyChecking=no uptime