Detailed explanation of dos command line choice command

In the DOS command line, the choice command is used to wait for a period of time before the user enters an option. During the waiting period, the command will display a message telling the user which options can be selected and giving a time limit for the selection. The syntax is "CHOICE [/C choices] [/N] [/CS] [/T timeout /D choice] [/M text]".

In the DOS command line, the choice command is used to wait for a period of time before the user enters an option. While waiting, the command displays a message telling the user which options can be selected and giving a time limit for the selection. Once the time limit is reached, the command will perform actions according to the default options, or perform different actions based on the user's selection.

The syntax of the choice command is as follows:

CHOICE [/C choices] [/N] [/CS] [/T timeout /D choice] [/M text]

/C choices     指定可供选择的字符列表（必选项）。
/N             不显示任何提示或消息。
/CS            使用大小写敏感模式。
/T timeout     指定命令等待用户输入的时间（以秒为单位）。
/D choice      指定默认选项。
/M text        指定要显示的消息文本。

For example, the following command will wait for 5 seconds and ask the user to select Y or N:

CHOICE /C YN /T 5 /D N /M "Do you want to continue?"

The meaning of this command is, in After waiting for 5 seconds, if the user does not enter anything, the N option is selected by default, otherwise the corresponding operation is performed according to the user's selection.

When using the choice command, you need to pay attention to the following points:

1. The list of characters to choose from must be specified after the /C parameter. This list can contain any number of characters, but each character must be unique.

2. /N parameter is used to suppress the display of prompts or messages. If this parameter is not specified, a message is displayed during the wait telling the user which options are available.

3. /CS parameter is used to use case-sensitive mode. If this parameter is not specified, the selection is case-insensitive.

4. /T parameter is used to specify the time (in seconds) for the command to wait for user input. If the user does not make a selection within the specified time, the option specified by the /D parameter is selected by default.

5. /D parameter is used to specify the default options. If the user does not make a selection within the specified time, the option specified by the /D parameter is selected by default.

6. /M parameter is used to specify the message text to be displayed. The message should be clear and help the user make the right choice.

In general, the choice command is a very useful command, especially when similar confirmation operations are required. It helps users make the right choice and can perform corresponding actions based on the user's choice.

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