I have been successful at getting wusa.exe to run and create its' own error log. How can I get it to pass any errors to Powershell so they can be written into the scripts logfile?
wusa $item /quiet /norestart | Out-Null "$(Get-TimeStamp) | SUCCESS | Installed $item" | Out-File -FilePath $logpath -Append -Encoding ASCII
you can get the possible command line arguments wusa is able to process. I would assume they didn't design it to pass errors to the shell in another way than writing a log file. But because you can specify the log file wusa should use you could get the content of that log file and include it in whatever you like. 😉
BTW: In your example you actually throw away everything wusa could possibly output with "| Out-Null"
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Looks like its got a chapter on exactly what your looking for. "Logging and Error Handling Best Practices for Automating Windows Update Installs"
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