亲测，在古月大大这篇博客中的一条命令最好改为rostopic pub /cmd_vel geometry/Twist -r 10 -- '[0.2,0,0]' '[0,0,0.5]'.
rostopic pub /cmd_vel geometry/Twist -r 10 -- '[0.2,0,0]' '[0,0,0.5]'
http://blog.csdn.net/hcx25909/article/details/8870552