Mass-replacing Files?

Admittedly, it's probably a simple answer that's right under my nose, but I am looking for some sort of SSH command(or software of some kind) that can mass-replace or even delete files of a certain name on a server. I require this to fix some vandalism that occured on to all of my server's index files.... I would like to switch them to plain blank pages instead. However, I can't find out any method of accomplishing this.
Any help at all is greatly appreciated. Mass-replacing Files?

 

 

 

 

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