Feature Activation

We want to activate the existing future for more than 100+ site-开发者_StackOverflow社区collections, what would be the right choice? can we achieve this through Powershell?

If you don't want to code yourself, you can always download the SharePoint Feature Admin Tool from Codeplex.com.
It will allow you to select a Web Feature and activate/deactivate in recursively on a Site Collection.

Yes powershell would make this easy.

But there is also the stsadm command "activatefeature". Together with the stsadm command "enumsites" and a bit of creating command script building you should go a long way.