Errorlevel and Findstr

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ErrorLevel is not %ERRORLEVEL% . This is probably the first one you should read.

Next is the usage of the ERRORLEVEL statement. https://support.microsoft.com/kb/69576

 

The following table shows the effect of statement when writing your batch scriipt.

Statement Algebraic Equivalent.
IF ERRORLEVEL 5 ... IF E = 5 OR E > 5 THEN ...
IF NOT ERRORLEVEL 6 IF E < 6 THEN ...

Here is a sample using findstr and error level. Findstr returns 0 if it successfully finds any occurrence.

 findstr -sip Failed log.txt > NULL
IF NOT ERRORLEVEL 1 ( 
    echo Found.
) else (
    echo Not Found.
)