Active Directory扩展属性从CSV批量更新

I'm working towards making changes to over 3000 users in Active Directory. Each one needs to have 3 additions made to there attributes section extensionAttribute3, extensionAttribute4, and extensionAttribute5. Can someone help me with a command line entry that accesses a CSV and fills in the information based on the information in the CSV?I'm working towards making changes to over 3000