Remove trailing spaces from Azure tag names

Remove-AzTagTrailingSpace.ps1

#
# Rough and ready script to clean up trailing spaces from tag names
# Loops through all resources and resource groups under all subscriptions to which you have access.
# If a resource isn't already tagged with the clean (same name with no trailing space) then the clean tag name is given the diry tag's value, and the dirty tag is removed.
# If a resource has both clean and dirty tags, this shows a warning (even if the values are the same... I was lazy / didn't add a check for that) and leaves to the caller to fix manually.
# If a resource doesn't have any dirty tags, it's not affected.
#

Clear-Host
Login-AzAccount # (interactive / opens web browser)
$subs = Get-AzSubscription 
foreach ($sub in $subs) {
    Write-Verbose "Processing sub $($sub.Name)" -Verbose
    Set-AzContext -SubscriptionObject $sub | Out-Null
    [PSObject[]]$tags = Get-AzTag -Detailed | ?{$_.Name  -like '* '} 
    foreach ($tag in $tags) {
        foreach ($value in $tag.Values.Name) {
            $rs = Get-AzResource -Tag @{"$($tag.Name)" = "$value"}
            $rgs = Get-AzResourceGroup  -Tag @{"$($tag.Name)" = "$value"}
            foreach ($r in $rs) {
                Write-Verbose "- resource: $($r.ResourceId)" -Verbose
                $rt = $r.Tags
                if ($rt.Keys -contains "$($tag.Name.Trim())") {
                    Write-Warning "- - Trimmed tag already exists; not updated: $($tag.Name)"
                } else {
                    $rt.Add("$($tag.Name.Trim())", $value)
                    $rt.Remove($tag.Name)
                    Set-AzResource -ResourceId $r.ResourceId -Tag $rt -Force
                    Write-Verbose "- - UPDATED: $($tag.Name)" -Verbose
                }
            }
            foreach ($rg in $rgs) {
                Write-Verbose "- resource group: $($rg.ResourceId)" -Verbose
                $rgt = $rg.Tags
                if ($rgt.Keys -contains "$($tag.Name.Trim())") {
                    Write-Warning "- - Trimmed tag already exists; not updated: $($tag.Name)"
                } else {
                    $rgt.Add("$($tag.Name.Trim())", $value)
                    $rgt.Remove($tag.Name)
                    Set-AzResourceGroup -ResourceId $rg.ResourceId -Tag $rgt 
                    Write-Verbose "- - UPDATED: $($tag.Name)" -Verbose
                }
            }
        }
    }
}