Turning off sharing with externals on all sharepoint sites, teams and groups?

Hi,

I am looking to see if it's possible thru powershell to turn off the sharing capability of all sharepoint sites. groups and team sites?

It's very hard to go thru every 30 sharepoint sites/groups and edit bulking them when there's over 1,000.

This what I mean....

Is it possible to do in PowerShell?