git-update-branch [options] [--] [<branch>...]

Performs a fast-forward update of the given branches to the upstream tracking branch. If no branches are specified, the current branch is updated.

• -h, --help: Print a usage message and exit.
• -a, --all: Update all local branches (no branch arguments may be given).
• -q, --quiet: Don't print log messages.
• --: Treat the remaining arguments as branch names.