Powershell: Comparing Array (-notcontains) will not work

Question

I want to compare two Lists of Arrays and to display the Delta in a third array:

$ListOfVMs
$ListOfRunningVMs

$StoppedVMs = $ListOfVMs | { Where-Object $_.Name -notcontains $ListOfVMs.Name }

This Filter delivers still the complete Content of $ListOfVMs and not only the Delta. What I am doing wrong?

AdminOfThings · Accepted Answer · 2021-02-04 15:48:47Z

3

You may do the following:

$StoppedVMs = $ListOfVMs | Where-Object Name -notin $ListOfRunningVMs.Name

You need to pipe to Where-Object. Where-Object is what contains the script block (if you need to use it). You are also not comparing both lists here as you only reference $ListOfVMs.

Since you are comparing a single item against a collection, you will want to use -notin if the single item is on the left-hand side (LHS). -notcontains would be used if the collection is on the LHS.

answered Feb 4, 2021 at 15:48

AdminOfThings

25.2k4 gold badges22 silver badges30 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Gill-Bates Over a year ago

Sorry, I was not specific enough. I am using the Pipe!

Collectives™ on Stack Overflow

Powershell: Comparing Array (-notcontains) will not work

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related