Run multiple commands sequentially in the Exchange Management Shell

Need to export a bunch of mailboxes to PST files. I know the command for the Management Shell:

New-MailboxExportRequest -Mailbox "JohnSmith" -FilePath \\SERVERNAME\FOLDERNAME\JohnSmith.pst

How do I run 50 of these one after the other?

I assume I put all the command lines in a text file then somehow apply it so they all queue u.
snooflehammerAsked:
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Shaun VermaakTechnical SpecialistCommented:
I have seen background workers and threads for Powershell, will see if I am get a good example

Here is an application I wrote to do generic threading with any exe (including Powershell)
https://www.experts-exchange.com/articles/30139/How-to-thread-single-threaded-applications.html
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