think GitHub itself does a good job on this already. You can search, click the edit button at the top of a file (forks and opens online editor), make your chang

think GitHub itself does a good job on this already. You can search, click the edit button at the top of a file (forks and opens online editor), make your changes with the commit message being used for the PR text and then click the PR button. The online editor is perfectly fine for small changes. Edit: Maybe I got your question wrong. Are you trying to apply the same search/replace to multiple repos?