In order to list all resource groups that start with rg, for example, type:

az group list --query "[?starts_with(name,'rg')].name" --output tsv

In order to check the size of the managed disk in Azure, type:

az disk show --resource-group yourresourcegroup --name yourdiskname --query diskSizeGb

In order to view current disk performance SKU in Azure, type:

az disk show --resource-group yourresourcegroup --name yourdiskname --query sku

In order to view all properties of a managed disk in Azure type:

az disk show --resource-group yourresourcegroup --name yourdiskname

After an initial deployment, you might find yourself in need to change the size of the Azure managed disk you’ve just deployed. For example, if you want to change the size of it to 64GB, type:

az disk update --resource-group yourresourcegroup --name yourdiskname --size-gb 64