How can I make PowerShell wait until a command is complete before proceeding?

Question

I'm using the following line to uninstall office 2007 based on its Product ID

Start-Process C:\Windows\System32\msiexec.exe -ArgumentList "/uninstall {90120000-0030-0000-0000-0000000FF1CE}"

I'd like to force a reboot after the uninstall is complete however using -Wait or piping the results to Out-Null don't wait until the uninstall is complete before processing the next line which is a restart. I've also tried using cmd to uninstall but with the same result.

cmd /c "msiexec.exe /uninstall {90120000-0030-0000-0000-0000000FF1CE}"

Is there any way to force powershell to wait until the uninstall is complete before processing the Restart-Computer command? I was thinking possibly writing something that detects when the setup.exe process stops before proceeding to the restart?

Answer 1

The simplest workaround: pipe the result. This will force a wait until the process is finished.

No need for start-process or cmd.

You could pipe to out-default, out-file, out-null or out-host, depending on how you want to handle the output. (If you don't care about the output, simply use out-null.)

& msiexec.exe /uninstall "{90120000-0030-0000-0000-0000000FF1CE}" | Out-Null