Tags are merged when adding a new one with Azure CLI

[FBoucher]

Let's say I already have 2 tags:

• owner= frank
• demo=meetup

When running the code:

jsonrtag=$(az resource show -g summerDemo -n demoWebsite --resource-type "Microsoft.Web/sites" --query tags)

rt=$(echo $jsonrtag | tr -d '"{},\n' | sed 's/: /=/g')

az resource tag --tags $rt expireOn=2019-08-29 -g summerDemo -n demoWebsite --resource-type "Microsoft.Web/sites"

The final result will be 2 tags like this:

• expireOn=2019-08-29
• owner= frank demo=meetup

[adeelaleem]

We can also use below script to add tag on each resources from resource group:
$group = Get-AzResourceGroup "RGBP-Pipeline"
if ($null -ne $group.Tags) {
$resources = Get-AzResource -ResourceGroupName $group.ResourceGroupName
foreach ($r in $resources)
{
$resourcetags = (Get-AzResource -ResourceId $r.ResourceId).Tags
if ($resourcetags)
{
foreach ($key in $group.Tags.Keys)
{
if (-not($resourcetags.ContainsKey($key)))
{
$resourcetags.Add($key, $group.Tags[$key])
}
}
Set-AzResource -Tag $resourcetags -ResourceId $r.ResourceId -Force
}
else
{
Set-AzResource -Tag $group.Tags -ResourceId $r.ResourceId -Force
}
}
}

[FBoucher]

Thanks @adeelaleem, excellent idea it's been added to the PowerShell example. in the main ReadMe.md