Base Users Guide: 
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rocks iterate host [host...] [command] [command=string]
Iterate sequentially over a list of hosts. This is used to run a shell command on the frontend with with '%' wildcard expansion for every host specified.
arguments
Zero, one or more host names. If no host names are supplied iterate over all hosts except the frontend.
The shell command to be run for each host. The '%' character is used as a wildcard to indicate the hostname. Quoting of the '%' to expand to a literal is accomplished with '%%'.
parameters
Can be used in place of the command argument.
examples
Copies file to the /tmp directory of every compute node
Same as above