DOS Errorlevel command

DOS Errorlevel is a return code sent by a terminating program such as batch, exe, com or any applications. Errorlevels are not a standard feature of every command. What the return code means is up to the programmers thought. However, most programmers agree that an errorlevel 0 means the command executed successfully, and an errorlevel 1 or higher usually spells trouble. But there may be some exceptions to this general rule.
 

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DOS Errorlevel command
The combination of the two or more IF ERRORLEVEL or nested IF Errorlevel statements
Testing a specific error level using If errorlevel command