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PDSH (Parallel Distributed SHell) issues commands to groups of hosts in parallel. It is a rewrite of IBM's dsh implementation done at LLNL.

pdsh is a variant of the rsh(1) command. Unlike rsh(1), which runs commands on a single remote host, pdsh can run multiple remote commands in parallel. pdsh uses a "sliding window" (or fanout) of threads to conserve resources on the initiating host while allowing some connections to time out.

http://www.grid5000.fr/mediawiki/index.php/PDSH
http://linux.die.net/man/1/pdsh