Often when working with PowerShell you want to start an external process and wait for its completion. An example of this might look like this:
Write-Host "Show before starting Notepad" Notepad.exe Write-Host "Show after closing Notepad"
But this script prints the second line directly after starting notepad. There are several solutions possible, but this one has proved very useful.
Write-Host "Show before starting Notepad" Notepad.exe | Out-Null Write-Host "Show after closing Notepad"
Simply add Out-Null after the invocation of notepad and PowerShell will wait until it continues executing the script.