Since I have multiple colleagues in my team pushing out considerable amount of branches, whenever I want to disentangle my own branches I'd like to get a clear overview of only those. In summary I want to use git log --graph --oneline --decorate but only on branches:
Is there a git command that can realize this?
First, you can have all local branches with --branches.
Then, for the remote branches your local branches are tracking, you'll have to do a bit of mapping through git for-each-ref for instance:
git log --graph --branches --ignore-missing $(git for-each-ref --format="%(upstream:short)" refs/heads | sort -u)
(Thanks to Guildenstern for the --ignore-missing suggestion to avoid having to chase stale remote references beforehand.)