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I'm assuming you want to play each bag file in the folder sequentially one after another, not all of them in parallel.

I don't think this is a feature of the rosbag node, you could potentially do this using a bash script. However playing multiple ROS bag files one after another using separate rosbag play commands will cause some problems with the discontinuity of the time stamps.

It would be possible to write your own node using the rosbag Code API to playback a list of bag files in the way that you want. This way you could adjust the timestamps so they were continuous as multiple bags were played back.