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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Batch file: check for (non-)existence of registry key

Posted by jpluimers on 2021/01/05

Small batch file that only deletes a registry key if it exists:

reg query %1 >nul 2>&1
if %errorlevel% equ 0 reg delete %1 /f
goto :eof

It is based on:

  • redirecting both stderr and stdout to nul (the >nul 2>&1 bit)
  • checking reg query with the appropriate errorlevel value for equality (equ operator) for 0 (existence); you can also use 1 for non-existence.

Based on:


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