"azure" not recognized in Azure powershell
Your example command is an Azure cross-platform command line command. The equivalent PowerShell command is:
Get-AzureWebsiteLog websitename -Tail
First you need to install the powershell tool for the azure from azure site. This is another utility which recognise all the cmdlts which is assosicated with azure. After that it's very easy to use powershell ise.