Today we’re open sourcing git-xargs, a command-line tool (CLI) for making updates across multiple Github repositories with a single command. You give git-xargs a script to run and a list of repos, and it checks out each repo, runs your scripts against it, commits any changes, and opens pull requests with the results. At the end of each run, you get a detailed report on exactly what happened with each repo: For example, have you ever needed to add a particular file across many repos at once?