前情提要：使用rosrun运行节点
报错：
(cp) twilight@pc: ~/project/catkin_ws$ rosrun cpoint filter_test.cpp
[rosrun] Couldn’t find executable named filter_test.cpp below /home/twilight/project/catkin_ws/src/cpoint
[rosrun] Found the following, but they’re either not files,
[rosrun] or not executable:
[rosrun] /home/twilight/project/catkin_ws/src/cpoint/src/filter_test.cpp
问题定位：
一般是该cpp文件没有可执行权限
解决：
sudo chmod 777 xxx.cpp
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