若要帮助简化命令模式下的光标移动，当您在命令提示符处按 Esc 键时，请想象您加载的 $HISTFILE 为 vi 中的普通文件。
To help simplify the command-mode cursor movement, when you click Esc at a command prompt, think of your $HISTFILE being loaded as a normal file in vi.
温馨提示：如果密码为4位或5位，可在输入4位或5位密码后直接按确认键即可，无须在前面或后面加零补足6位。
Tips: for 4 or 5 digit password, you can press the button of "enter" after entering 4 or 5 digit password. It is not needed to enter zero before or after password to make up of 6 digits.
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