Starting with $TestReg = Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion'

I can individually get these values.

$TestReg.CurrentMajorVersionNumber = "10"
$TestReg.CurrentMinorVersionNumber = "0"
$TestReg.CurrentBuildNumber = "18363"
$TestReg.UBR = "592"

But I can't seem to glue these values together without creating and setting new variables first. I'm trying to find the most efficient way to do this for a specific script now but also the harder I search now, the more I want to know this for future projects.

I tried to concatenate "$var.name" "." "$var.name" etc but it stacks the entire $var together.

I tried to concatenate $var.name "." $var.name but it cannot combine system.int32

I tried using piping to Select, then Format-Table (to get rid of the select table headers) but then I remembered ft breaks the object pipeline if I recall correctly.

I've been googling for couple hours now and keep NOTing pieces like SQL and CSV but can't figure out how to do this.

What I want to do is get back the SCCM version "10.0.18363.592" string.

PS just in case that value is available somewhere else, I still would like to know how to break and build these pieces for future scripting.