List out AzureRM Operating Systems available

#Below command lists the Image Publishers available in the Specified location
Get-AzureRmVMImagePublisher -Location 'Southindia'

#Below command lists the Offer(offer means Windows flavour category) available with the Publishername
Get-AzureRmVMImageOffer -Location 'Southindia' -PublisherName 'MicrosoftWindowsServer'

#Below command lists the available SKU's under windows server
Get-AzureRmVMImagesku -Location 'Southindia' -PublisherName 'MicrosoftWindowsServer' -Offer 'windowsserver'

#Below command lists the version of the sku
Get-AzureRMVMImage -location 'Southindia' -publisherName "MicrosoftWindowsServer" -sku "2012-R2-Datacenter" -Offer 'windowsserver'

#Below Command lists the detials of the particual sku.
Get-AzureRMVMImage -location 'Southindia' -publisherName "MicrosoftWindowsServer" -sku "2012-R2-Datacenter" -Offer 'windowsserver' -Version '4.0.20161214'