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?

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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.

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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.