Exit Command :

It quits command prompt(cmd.exe) program or the current batch script.
To view 'exit' command with its all possible parameters you can use following command. Its like help information to regarding that command.

exit /?

Syntax :

EXIT [/B] [exitCode] 


where,

/B : It specifies to exit from current batch file script
 instead of cmd.exe. If executed from outside a batch
 script, it will quit cmd.exe

exitcode : It specifies a numeric number. If /B is
 specified, it sets ERRORLEVEL that number. If quitting
 cmd.exe, it sets the process exit code with that number.

Use 1:

exit

Output :

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

D:\DINESH > exit