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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.
 

Related Topics

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