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How can I get the name of presently running launch file from the node?

I don't believe there is API to do that, at least not "from the node". Nodes have no idea they were started by roslaunch.

There might be a hacky way using some roslaunch internal API, but I haven't checked.

But tbh, I don't completely understand why you'd want to do this.

Can you describe a bit clearer why you feel "get[ting] the name of presently running launch file from the node" is the solution to your problem?

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