Find security and distribution groups with owners whose account is disabled - powershell

Question

I'm looking for some guidance on creating a powershell script that will check security and distribution groups from specific OU's and see if the owner is a user who's disabled.
We have lots of old groups in our AD created by ex employees that need to be cleaned up.
This is what i've started with.
$managedByGroups = get-adgroup -filter 'groupCategory -eq "Distribution"' -SearchBase "OU=SydExchangeGroups,OU=SydGroups,OU=Sydney,DC=my,DC=org,DC=biz" -Properties distinguishedname, managedby | select sAMAccountName, managedby
$disabledUsers = Get-ADUser -Filter {Enabled -eq $false} -SearchBase "OU=SydDisabledUsers,OU=SydMisc,OU=Sydney,DC=my,DC=org,DC=biz" | select distinguishedname
foreach ($group in $managedByGroups){
if($managedByGroups.managedby -eq $disabledUsers.distinguishedname)
{
write-output
}
}
Thanks

Answer 1

There are a number of issues with your if block:
you are looping through $managedByGroups, but you are never using that variable (it should be $group.managedby)
you are trying to compare 1 element with a list of elements, in this case consider using -in operator instead of -eq.
you should treat the case when there is no value for managedby attribute, in case you do not get the desired results.
An alternative to your code may is below.
I'm first getting the list of managedby users, then i'm looping though each entry, and if it is not null, we try to do a get-aduser filtering by enabled status and the distinguishedname.
$DisabledManagedBy variable will contains ADUser objects which are disabled.
$grp = get-adgroup -filter 'groupCategory -eq "Distribution"' -Properties ManagedBy,DistinguishedName
$DisabledManagedBy = foreach ($item in $grp.ManagedBy) {
if ($item) {
Get-ADUser -Filter {Enabled -eq $false -and DistinguishedName -like $item} -Properties DistinguishedName
}
}

Answer 2

I worked this out eventually by doing the following:
$myDisabledUsers = #()
$date = get-date -format dd-MM-yyyy
$managedSydGroups = Get-ADGroup -Filter * -Properties * -Searchbase "OU=SydExchangeGroups,OU=SydGroups,OU=Sydney,DC=my,DC=biz,DC=org" | where {$_.managedby -ne $null} | select name, managedby
$disabledSydUser = Get-ADUser -Filter * -SearchBase "OU=SydDisabledUsers,OU=SydMisc,OU=Sydney,DC=my,DC=biz,DC=org" | where {$_.enabled -eq $false} | select -ExpandProperty distinguishedname
$disabledOwners = foreach($group in $managedSydGroups)
{
$managedByString = [string]$group.managedby
if($disabledSydUser -contains $managedByString)
{$myDisabledUsers += $group}
}