Open a terminal and run,
roscoreOpen a 2nd terminal in the workspace root and run,
source devel/setup.bashrosrun session3_pubsub publisherOpen a 3rd terminal in the workspace root and run,
source devel/setup.bashrosrun session3_pubsub subscriberOpen a 4th terminal in the workspace root and run,
source devel/setup.bashrosrun session3_pubsub publisherOpen a terminal and run,
roscoreOpen a 2nd terminal in the workspace root and run,
source devel/setup.bashrosrun session3_pubsub publisher __name:=publisher1Open a 3rd terminal in the workspace root and run,
source devel/setup.bashrosrun session3_pubsub subscriberOpen a 4th terminal in the workspace root and run,
source devel/setup.bashrosrun session3_pubsub publisher __name:=publisher2