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You might want to look into creating a launch file see roslaunch, it will start and stop roscore for you. Plus you can have as many nodes as you want and it only takes up one terminal.

http://wiki.ros.org/roslaunch

If you are want to run a node(s) every time you boot up your computer have a look at the robot_upstart package. http://wiki.ros.org/robot_upstart

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