Feh

#!/bin/bash
# fast-forward local tracking branch if you get something like (on git checkout):
# Your branch is behind 'origin/master' by 1 commit, and can be fast-forwarded.
# Author: Valentin Haenel <[email protected]>
# Licence: wtfpl <http://sam.zoy.org/wtfpl/>

BRANCH=$( git branch | grep ^* | cut -f1 -d' ' --complement )
if [[ -z $BRANCH ]] ; then
    # not a git repository
    exit 1