How to tell PowerShell to wait for each command to end before starting the next?

powershell wait execution
John Mee picture John Mee · Nov 16, 2009 · Viewed 457.3k times · Source

I have a PowerShell 1.0 script to just open a bunch of applications. The first is a virtual machine and the others are development applications. I want the virtual machine to finish booting before the rest of the applications are opened.

In bash I could just say "cmd1 && cmd2"

This is what I've got...

C:\Applications\VirtualBox\vboxmanage startvm superdooper
    &"C:\Applications\NetBeans 6.5\bin\netbeans.exe"

Answer

Keith Hill picture Keith Hill · Nov 16, 2009

Normally, for internal commands PowerShell does wait before starting the next command. One exception to this rule is external Windows subsystem based EXE. The first trick is to pipeline to Out-Null like so:

Notepad.exe | Out-Null

PowerShell will wait until the Notepad.exe process has been exited before continuing. That is nifty but kind of subtle to pick up from reading the code. You can also use Start-Process with the -Wait parameter:

Start-Process <path to exe> -NoNewWindow -Wait

If you are using the PowerShell Community Extensions version it is:

$proc = Start-Process <path to exe> -NoNewWindow -PassThru
$proc.WaitForExit()

Another option in PowerShell 2.0 is to use a background job:

$job = Start-Job { invoke command here }
Wait-Job $job
Receive-Job $job

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