# UNDEFINE Command [GstarCAD 2022](Help%20System/GSTARCAD/2022/Index.md) → [Commands](Help%20System/GSTARCAD/2022/Commands/(Commands).md) → [U](Help%20System/GSTARCAD/2022/Commands/U/(U).md) ## Function Description: This command is used to allow the command defined by the application to replace the internal command. Users can forbid a command by entering the command name under the UNDEFINE command prompt. The forbidden command can be redefined to execute other functions. ## Command Access: > **Icon:** / > **Menu: /** > **Ribbon: /** > **Toolbar: /** > **Command:** UNDEFINE > **Alias:** > / ## Command Prompts: Enter command name: