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When using the Haochen CAD drawing software to create drawings, CAD commands are often needed in order to draw quickly. Some of these commands have similar functions, and some people are unable to clearly distinguish the differences between them. Next, let’s take Undo/u/oops as an example to explain the differences between CAD commands! UNDO means giving up, which is equivalent to going back. It can be used continuously until it returns to the state when the file was created. U is the abbreviation for UNDO, acting as a shortcut key. The specific features are the same as those above. OOPS means not going back, but bringing back the last deleted object instead. All operations after deletion are still there. For example, if you delete a circle and draw a square, and then realize you need the circle back, using U to go back to the circle will result in the newly drawn square disappearing ； If OOPS is used, the square remains, and the circle also appears. However, after each deletion command is executed by OOPS, it can only be used once; using it again will no longer work. U is the “standard” toolbar: to undo, you can type u any number of times; each time this is done, the graphic moves back one step, until it is in the same state as it was at the beginning of the current editing task. You can also use CTRL+Z to undo. The effect is the same as UNDO. When undoing, you can enter the number of steps to cancel. The effect is the same as entering u multiple times. The OOPS command can restore objects deleted by the previous ERASE command. Of course, OOPS can also be used after the BLOCK or WBLOCK commands, as these commands allow you to delete selected objects after creating a block and then restore them. The above explains the differences among the three CAD commands Undo, U, and Uoops in the HaoChen CAD drawing software; those who are not familiar with them can take a look!