Ros Knowledge (7)----The confusion of single quotes ' and ' in the ROS command

The difference between the single quotation mark ' and ' in the Ros command, such as using the ' single quote ', is correct for the following commands:

$ rosrun Rviz rviz-d ' rospack find Rbx1_nav '/sim.rviz

Instead of using ' single quotation marks, the following commands are wrong:

$ rosrun Rviz rviz-d ' rospack find Rbx1_nav '/sim.rviz

The command can execute and start Rviz, but it cannot be indexed to the corresponding. rviz file, so the corresponding configuration file is not displayed correctly.

Ros Knowledge (7)----The confusion of single quotes ' and ' in the ROS command