File redirection in Windows and %errorlevel%

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You can use the following:

C:\>type nul > C:\does\not\exist\file.txt && echo ok || echo fail
The system cannot find the path specified.
fail

C:\>echo %errorlevel%
1

I always assumed the && and || operators used ERRORLEVEL, but apparently not.

Very curious that ERRORLEVEL is set after redirection error only if you use the || operator. I never would have guessed. Nor would I ever have bothered to test if not for your excellent question.

If all you want to do is set the ERRORLEVEL upon redirection failure, then of course you can simply do:

type nul > C:\does\not\exist\file.txt || rem

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