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sourcing a 'setup.bash' file, whether the base ROS one in /opt/ros/indigo, or the one in you workspace (devel/setup.bash), is only necessary once per terminal (instance of bash shell) that you open. This will load the ROS environment, giving you access to ros* and catkin* commands.

Therefore, if you add it to ~/.bashrc, you will only need to run source if you want to SWITCH workspaces.

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