输入
~$ rosrun turtlesim
错误
Usage: rosrun [--prefix cmd] [--debug] PACKAGE EXECUTABLE [ARGS]
rosrun will locate PACKAGE and try to find
an executable named EXECUTABLE in the PACKAGE tree.
If it finds it, it will run it with ARGS.
解决方法
在输入
~$ rosrun turtlesim
后,不要按回车键,而要按Tap键!!!