I’ve written my answer some time ago and last downvote motivated me to update it with my later experience 🙂
Edit: previous version of this answer created branches with ‘origin’ prefix, all pointing to master branch, instead of actual branches, and having problems with variable expansions. This has been fixed as per comments.
You can fetch one branch from all remotes like this:
Fetch updates local copies of remote branches so this is always safe for your local branches BUTthat means:
So if you will probably want to run:
However, this can be still insufficient. It will work only for your local branches which track remote branches. To track all remote branches execute this oneliner BEFORE
(it seems that pull fetches all branches from all remotes, but I always fetch first just to be sure)
Run the first command only if there are remote branches on the server that aren’t tracked by your local branches.