What is the easiest way to reset ERRORLEVEL to zero?

Question

I have a post-build event that runs some commands for a c# project. The last command would sometimes cause the ERRORLEVEL value not equils to zero and then the build fails.

I want to append an extra line of command to always set the ERRORLEVEL value to zero. What is the most convenient way to do that?

Answer 1

Seems to do the trick:

ver > nul

Not everything works, and it is not clear why. For example, the following do not:

echo. > nul
cls > nul

Answer 2

I found that "exit 0" looks like a good way to deal with this problem.

Answer 3

if you use exit /b 0 you can return an errorlevel 0 from within a child batch script without also exiting the parent.

Answer 4

In a pre- or post-build event, if the return code of an executable is greater than zero, and the call to the executable is not the last line of the pre- or post-build event, a quick way mute it and avoid triggering a check for a non-zero errorlevel is to follow the failing line with a line that explicitly returns zero:

cmd /c "exit /b 0"

This is essentially a generic combination of the previously-mentioned solutions that will work with more than just the last line of a pre- or post-build event.

Answer 5

add ">nul" after each command that's likely to fail - this seems to prevent the build from failing. You can still check the result of the command by examining %errorlevel%. e.g. findstr "foo" c:\temp.txt>nul & if %errorlevel% EQU 0 (echo found it) else (echo didn't find it)