Detecting Errors

In a batch file (Dos only) you can test for problems using the ERRORLEVEL command. ERRORLEVEL returns only the first number of the error. Since errors involving similar parts of the computer start with the same number, this should be enough to narrow the problem down.

In the example below if the ERRORLEVEL command detects an error it will displays a message based on the error code. ?? Does not display error code.

@ECHO OFF
DISKDUPE
IF ERRORLEVEL=3 GOTO THREE
IF ERRORLEVEL=2 GOTO TWO
IF ERRORLEVEL=1 GOTO ONE
GOTO NOERROR
:ONE
Echo Error code 3: Setup error.
GOTO END
:TWO
Echo Error code 2: Disk read error.
GOTO END
:ONE
Echo Error code 1: User escape
GOTO END
:NOERROR
ECHO Error code 0: No errors.
:END