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  1. or download this
    # successful command and exit code
system ('dir');
...
# UN-successful command and exit code
system ('dri');
print qq(ERR Code = $?\n);
  2. or download this
    C:> set /?
[...]
...
%CMDEXTVERSION% - expands to the current Command Processor Extensions 
+version number.

%CMDCMDLINE% - expands to the original command line that invoked the C
+ommand Processor.
  3. or download this
    if %ERRORLEVEL% 2 perl -x -S %0 %*