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Editorial Team
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Asked: 2026-06-11T18:01:33+00:00

I have a log file with output of command in my batch file. I

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I have a log file with output of command in my batch file.
I want to review on this file and check if there were an error.
this is the row of this file with error:

9/20/2012 7:22:34 AM [Error] Error occured while reloading resource table: VALUE is duplicated

how I can to check it?
I try the following: 

for /f "tokens=4 %%x in (%TMPLog%) do 
    if "%%x"=="ERROR" SET err=TRUE

but it doesn’t work.

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1 Answer

  1. Editorial Team

    You can have that much easier:

    findstr /l /c:"[Error]" "%TMPLog%" >nul 2>&1 && set err=1

    Another random note: For boolean variables I tend to have the pattern of the variable being defined when it’s true and not defined when it’s false. Then you can simply check it with if defined err which reduces errors from mistyping the comparison value and also works properly in blocks without delayed expansion (another common source of mistakes). Just if you were wondering why I used set err=1 instead of set err=TRUE.

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