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In that case just put it in a normal <node> tag and everything should work. As it is, it is clear that it will wait as the param handling will wait for the command to finish to read in the parameter.

In that case If it waits for Ctrl-C to kill the nodes, just put it in a normal <node> tag and everything should work. As it is, it is clear that it will wait as the param handling will wait for the command to finish to read in the parameter.

I'm not sure if Ctrl-C will conflict with roslaunch catching Ctrl-C to shutdown the launch. Then you'd need to wrap that script.