git-branch-status

#!/bin/bash
# by http://github.com/jehiah
# this prints out some branch status (similar to the '... ahead' info you get from git status)

# example:
# $ git branch-status
# dns_check (ahead 1) | (behind 112) origin/master
# master (ahead 2) | (behind 0) origin/master

tot_diff=0

git for-each-ref --format="%(refname:short) %(upstream:short)" refs/heads | \
while read local remote
do
    [ -z "$remote" ] && continue
    git rev-list --left-right ${local}...${remote} -- 2>/dev/null >/tmp/git_upstream_status_delta || continue
    LEFT_AHEAD=$(grep -c '^<' /tmp/git_upstream_status_delta)
    RIGHT_AHEAD=$(grep -c '^>' /tmp/git_upstream_status_delta)
    tot_diff=$LEFT_AHEAD+$RIGHT_AHEAD+$tot_diff
    echo "$local (ahead $LEFT_AHEAD) | (behind $RIGHT_AHEAD) $remote"
done

if [ "$tot_diff" == "0" ]; then
    echo "Everything is synchronized."
fi

building on @knovoselic version - i prettified it a bit more:

• formatted results into columns
• added ability to filter by branch name and to show locals
• removed the temp file i/o
• added some switches and usage message

https://gist.github.com/bill-auger/9335fe2633eae38d3070