Base Users Guide: 
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rocks run host [host...] {command} [collate=string] [command=string] [delay=string] [managed=boolean] [num-threads=string] [stats=string] [timeout=string] [x11=boolean]
Run a command for each specified host.
arguments
Zero, one or more host names. If no host names are supplied, the command is run on all 'managed' hosts. By default, all compute nodes are 'managed' nodes. To determine if a host is managed, execute: 'rocks list host attr hostname | grep managed'. If you see output like: 'compute-0-0: managed true', then the host is managed.
The command to run on the list of hosts.
parameters
Prepend the hostname to every output line if this parameter is set to 'yes'. Default is 'no'.
Can be used in place of the 'command' argument.
Sets the time (in seconds) to delay between each executed command on multiple hosts. For example, if the command is run on two hosts and if the delay is 10, then the command will be executed on host 1, then 10 seconds later, the command will be executed on host 2. Default is '0' (no delay).
Run the command only on 'managed' hosts, that is, hosts that generally have an ssh login. Default is 'yes'.
The number of threads to start in parallel. If num-threads is 0, then try to run the command in parallel on all hosts. Default is '128'.
Display performance statistics if this parameter is set to 'yes'. Default is 'no'.
Sets the maximum length of time (in seconds) that the command is allowed to run. Default is '30'.
If 'no', disable X11 forwarding when connecting to hosts. Default is 'yes'.
examples
Run the command 'hostname' on compute-0-0.
Run the command 'ls /tmp/' on all compute nodes.
rocks run host sec_attr {file}
This command reads a filename that contains pickled information about secure attributes that are relevant to the host. This command is not intended to be run by an administrator.
arguments
Filename of the pickled file
rocks run roll [roll...]
Installs a Roll on the fly
arguments
List of rolls. This should be the roll base name (e.g., base, hpc, kernel).
examples
Installs the Viz Roll onto the current system.