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Running a roscore provides your system with a /rosout. After running your roscore, type 'rosnode list' to verify this. Your sample node should automatically to the roscore. To verify this, run your node, then run 'rxgraph'. See the line connecting your node and rosout? That means it's connected to the roscore.

Also, in roscpp, when you start a node you might get one of two messages: 1. "core service [/rosout] found" -- meaning the node found the roscore 2. "starting new master (master configured for auto start)" -- meaning a new roscore was started

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