CLI(command-line interface,命令行界面)是指可在用户提示符下键入可执行指令的界面,
它通常不支持鼠标,用户通过键盘输入指令,计算机接收到指令后,予以执行。
如果用户在输入的过程中敲击Tab制表键,那么CLI会自动补全可能的关键字或者函数名
一般用于自动补全命令跟函数
A command-line user interface (CLI), also known as a console user interface,[1] and character user interface (CUI), is a means of interacting with a computer program where the user (or client) issues commands to the program in the form of successive lines of text (command lines).