Create git branches in multiple repositories at the same time

Question

I have twenty git repositories on github and I want to be able to create a branch in all the twenty repositories with one command or click (without going through to all the twenty repos manually one at a time).

I do understand that I may write a shell script to do that. I am wondering if I am able to utilize sub modules of if there is any other way? Not sure, any help is appreciated.

Answer 1

Considering you can push to multiple repositories at one, you could define in your local repo an remote "all" referencing those 20 repos, create a local orphan branch, and push that branch to "all"

If your branch is supposed to start from an existing branch, then submodules are indeed a better solution, as you might be talking about 20 different repositories, each one with their own existing history.

With a local repo referencing in a .gitmodules 20 repos, you can use (as in here) the git submodule foreach syntax in order to create and push that new branch (git checkout master; git checkout -b new_branch; git push -u origin new_branch, wrapped in a script as in this answer)