How to make the same change in multiple GitHub repos

update_multiple_repos.md

A concrete example how I automated a chore update of multiple repostitories that I do not own => to create pull requests (PRs) with the same simple change in each repo.

• Install https://cli.github.com/ and gh auth login
• mkdir testingjavascript && cd $_
• Navigate to a GitHub topic like https://github.com/topics/testingjavascript (or epicreact-dev, ...) to get a list of repo links, e.g. execute following in browser console:

copy([
  ...new Set($$('h1 > a[href^="/kentcdodds/"]').map(el => `gh repo fork ${el.href}.git --clone --remote`))
].join('; '))

• paste the shell command, review, and execute in the new directory
• review that you have correct repos
• display your browser and bash terminal side by side
• make the small change in each directory and open new PRs in browser tabs (to review each before submitting)

ls -d */ | xargs -I {} bash -c "cd '{}' \
&& echo '.eslintcache' >> .gitignore \
&& git add . \
&& git commit -m 'chore: ignore .eslintcache' \
&& git push \
&& gh pr create --web"

Note: the double >> is important if you want to only modify the last line of file and not modify whole file with single >. Of course, you also need to modify your commit message to match your change 😉

FTR this was a workaround for facebook/create-react-app#10161