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 Press Esc to bail out of the current operation. Sometimes, you might get confused about what you’re doing in AutoCAD or what you’re seeing in the command line. If you need to bail out of the current operation, press Esc one or more times until you see a command line that has only “Type a command.” This indicates that AutoCAD is resting, waiting for your next command.

 Press Enter to accept the default action. Some command prompts include a default action in angled brackets. For example, the first prompt of the POLygon command is Enter number of sides <4>:The default is four sides, and you can accept it by simply pressing Enter. (That is, you don’t have to type 4 first.)

  AutoCAD uses two kinds of brackets when it prompts.Command options appear in regular square brackets: [Close Undo]. To activate a command option, type the letter(s) that appear in uppercase and then press Enter, or click the option directly in the command line.A default value or option appears in angled brackets: <4>. To choose the default value or option, press Enter. You can also right-click and choose Enter as input to a command. Easier yet, you can use the spacebar instead of Enter, as long as you’re not entering text.