A simple shell script to pull updates for all of your repos.

gitbump.sh

#!/bin/sh
#
# Pulls updates for your repos, including registered submodules.
#
# Put this file in the directory containing all yer git repos.

GITS=`find . -type d -name .git`
START=`pwd`

for i in $GITS; do
  REPO=`dirname $i`; 
  echo "\n=> Updating $REPO ..."
  cd $REPO;
  git pull
  git submodule update
  cd $START
done