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This question is directly related to a problem you are trying to solve in your previous question.
Make sure you are familiar with this tutorial.
In short, there are install space and development space. If you source devel/setup.bash
then roscd beginner_tutorials
should bring you to ~/catkin_ws/src/beginner_tutorials
. But if you source install/setup.bash
then it will bring you to the directory where the package was installed.