slides:
https://www.gitbook.com/book/sychaichangkun/ros-tutorial-icourse163/details
only on folder
then apply catkin_make
and we have much more files
try to create a package:
add dependency: roscpp rospy std_msgs(standard messages) and nav_msgs(navigation message)
https://github.com/sychaichangkun/ROS-Academy-for-Beginners
source之后在不同终端里还得重新source一遍。
/.bashrc文件最下面的内容
