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You can call the LINE command by directly inputting L in Haochen CAD software. Everyone calls L the CAD shortcut key for straight line, and in Haochen CAD software, L is called the command alias of LINE. So what is the difference between CAD command aliases and CAD shortcut keys? Let me introduce it to you in detail below! 1. Different usage methods: CAD shortcut keys are F1, CTRL+A, function keys and key combinations similar to this. Pressing the shortcut keys on the keyboard can directly execute commands or modify settings. For example, pressing CTRL+A will directly execute the COPYCLIP (copy to clipboard) command, and pressing F1 will directly pop up help. CAD command aliases are different. After the command alias is entered, it will appear on the command line. You need to press the Enter key to confirm before it can be executed. For example, after entering L, if you do not press the Enter key, there will be no action. The straight line command will be executed only after pressing the Enter key. 2. Customization methods Different CAD shortcut keys are defined in menus and interface files. Higher versions can be defined using CUI commands. file:///C:/Users/11430/AppData/Local/Temp/msohtmlclip1/01/clip_image001.pngCAD命令别名是由一个特殊的文本文件定义的，别名文件的扩展名为*.PGP（浩辰CAD为gcad.pgp）。我们可以根据自己的操作*惯将常用的命令定义为一个或两个字母，可以成倍提高命令的输入速度和绘图效率。file:///C:/Users/11430/AppData/Local/Temp/msohtmlclip1/01/clip_image002.png不过CAD命令别名作用类似CAD快捷键，都可以简化操作，提高工作效率，因此大家通常也把CAD命令别名叫做CAD快捷键。