safebase – git alias for backing up branch before rebasing

.gitconfig

[alias]
    # Returns name of current branch
    # Usage: git current
    current = rev-parse --abbrev-ref HEAD
    # Makes a full copy of the current branch with `backup.<epoch>` appended before doing an interactive rebase
    # Usage: git safebase HEAD~2
    safebase = !CURRENT=$(git current) && git branch -c $CURRENT $CURRENT.backup.$(date +%s) && git rebase -i