# U Command [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [Commands](Help%20System/GSTARCAD/2027/Commands/(Commands).md) → [U](Help%20System/GSTARCAD/2027/Commands/U/(U).md) ## Function Description: This command is used to quit the latest operation. You can enter u repeatedly, reversing one step at a time, until the drawing is as it was when you began the current editing session. When an operation can not be undone, the command name is displayed but no action is performed. Operations external to the current drawing, such as plotting or writing to a file, can not be undone. If you changed modes or used transparent commands during a command, their effects are undone, along with the effects of the main command. The U command is equivalent to entering undo 1. ## Command Access: > **Icon:**  > **Menu:** Edit > Undo > **Ribbon:** / > **Toolbar:** / > **Command:** U > **Alias:** / > **Shortcut:** CTRL+Z **Command Prompts: /** --- **Related Tasks：** - [To Delete Duplicate Objects (GstarCAD 2026)](../../../2026/Commands/01%20Procedures/To%20Delete%20Duplicate%20Objects.md) - [To Erase an Object (GstarCAD 2026)](../../../2026/Commands/01%20Procedures/To%20Erase%20an%20Object.md) --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/commandReferences_U/U.html) · © Gstarsoft Co., Ltd.