Powershell - Getting data, creating variables, and using it in a script.

I am learning PowerShell scripting. One of my stumbling blocks in learning is how to properly get data, and then using it later in the script.

For example. I need to get the GUID for a connected NIC. I can run the following which will get me the information.
get-wmiobject win32_networkadapter -filter "netconnectionstatus = 2" | select-object guid

However I would like to take that GUID store it in a variable to be called later. However when I do that I get additional information like:
guid
----

This presents an issue when I attempt to use it a different part of the script like this:

$GUID = get-wmiobject win32_networkadapter -filter "netconnectionstatus = 2" | select-object guid
set-location hklm:\system\currentcontrolset\services\tcpip\parameters\interfaces\$GUID

Please help shed some light on how to achieve this.
TechOps1Asked:
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oBdACommented:
Select-Object still returns an object, in this case with one property.
The solution is either to use "Select-Object -ExpandProperty ..." instead of "Select-Object -Property ...":
$GUID = get-wmiobject win32_networkadapter -filter "netconnectionstatus = 2" | select-object -ExpandProperty guid

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Or you address the property directly:
$GUID = (get-wmiobject win32_networkadapter -filter "netconnectionstatus = 2").GUID

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Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
The latter works always with PS3 and above, and with PS 2 only if there is a single object as result. Getting more than one object is not unlikely.
footechCommented:
For the second command, it may be worth mentioning that you can reference a property of an object stored as a variable.  For instance, within a string you would use a subexpression - $().
$GUID = get-wmiobject win32_networkadapter -filter "netconnectionstatus = 2" | select-object guid
set-location "hklm:\system\currentcontrolset\services\tcpip\parameters\interfaces\$($GUID.guid)"

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You do have to take care though to make sure you're dealing with only a single object.  If the first command returned more than one, then you would have to deal with each one individually, typically with a foreach loop or ForEach-Object cmdlet.
TechOps1Author Commented:
Thank you everyone for your help. This gets me going in the right direction.
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