I'm trying to write a simple batch file to check the cpu of the computer every 30 seconds and output to txt file with the current time. I want each line to be like:

Line1: %time% %cpu%
Line2: %time% %cpu%

This is what I came up with so far, didn't work:


echo %TIME% > C:\test.txt

wmic cpu get loadpercentage > C:\test.txt

timeout 30

goto loop
  • Is there a reason you're not using the native Windows performance monitoring tools for this? Jun 12, 2017 at 14:28

1 Answer 1


A big issue with your sample is the redirection operator '>' - This will always overwrite the data in test.txt with the new data being entered. Use '>>' to append the output to the end of the file without deleting the information that is already in the file.

Instead of fixing your batch script, this PowerShell one-liner will give you the same result with much less effort.

While($true){Get-WmiObject win32_processor | Select-Object @{L="Date";E={Get-Date}},LoadPercentage,SystemName | Export-Csv -NoTypeInformation -Append CPU.csv; Start-Sleep -Seconds 5}

You can even target a remote computer with:

Get-WmiObject -ComputerName <computer>

Sorry for not answering your specific question. I hope you will find what I have provided to be useful.

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