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No, I don't believe this is supported by the out-of-the-box roslaunch binary.

It evaluates the launch file (structure) once, sets parameters and then starts nodes.

If you need something like this you might want to take a look at the roslaunch Python library.

No, I don't believe this is supported by the out-of-the-box roslaunch binary.

It evaluates the launch file (structure) once, sets parameters and then starts nodes.

If you need something like this you might want to take a look at the roslaunch Python library.


Edit: just noticed that you tagged your question with boxturtle. That ROS version has been EOL since .. forever. Are you sure that's the correct tag for your question?