Web Reference: A .BAT batch script running the internal commands: APPEND, ASSOC, PATH, PROMPT, FTYPE and SET will only change the ERRORLEVEL if an error occurs. Other internal and external commands do not follow this rule. Jan 3, 2014 · If you want to return 1 as errorlevel at the end of a batch or command file, just write "@COPY SetErrorLevelTo1 dummy". It can be useful for example as part of a Visual Studio Pre- or PostBuild Event to cause stopping the build process. Modern batch scripting has a dynamic variable, %ERRORLEVEL%, which holds the exact value of the last exit code. This allows for much more intuitive and precise comparisons.
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