For running most commands, powershell and CMD work the same. One big difference I've found is that, when you use periods (.) in a command, they must be surrounded by quotation marks. For instance, this won't work:

mvn clean install -U -Docns.web.dynamic.content.version=2.6.0

But this will work:

mvn clean install -U "-Docns.web.dynamic.content.version=2.6.0"