Tutorial on using ver, vol, and ctty commands

Server displays DOS version

[Example] c: \> ver

The MS-DOS version 6.22

C: \>

Vol: displays the specified disk volume number.

[Example] c: \> vol

Volume in drive C is Wang

Volume serial number is 2116-1dd0

C: \>

Ctty Change Control Device

[Suggestion] for the input and output devices used to change the control, you can try this command, but I'm afraid there will be no
What is the function? It is one of the most useless commands in DOS.

[Usage] ctty [device name] setting Console

[Example] c: \> ctty aux sets aux as the input and output device.