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Adds .DS_Store, .Rproj.user, .Rdata, .Rhistory, and .httr-oauth to your global (a.k.a. user-level) .gitignore. This is good practice as it decreases the chance that you will accidentally leak credentials to GitHub. git_vaccinate() also tries to detect and fix the situation where you have a global gitignore file, but it's missing from your global Git config.