Ever needed to keep your forks in sync with their origin? This will help you for your GIT repositories.

git-sync.sh

#!/bin/sh
#
# GIT Repository update script by Sebastian Teumert
#
# Stashes local changes, checks out specified branch, pulls branch from origin
# and pushes to upstream.
#
# Used to keep forks synced with their origin
#
# When no argument is specified, this script works in pwd, works on the 'master'-
# branch and uses the git remote 'origin' to pull and 'upstream' to push


# help message
HELP="git-sync [-d|--dir <directory>] [-f] [-b|--branch <branch>] [-o|--origin|--pull <origin>] [-u|--upstream|--push <upstream>] [--filter]";

# default values
wd=$(pwd) # -d -dir
branch=master # -b -branch
force=false # -f -force
pull=origin # -o -origin -pull
push=upstream # -u -upstream -push
filter=*/ # -filter

# read options
while [ $# -gt 0 ]
do
    case $1 in
    -f) force=true;;
    -d|--dir) wd="$2" ; shift;;  
    -b|--branch) branch="$2" ; shift;;   
    -o|--origin|--pull) pull="$2" ; shift;;   
    -u|--upstream|--push) push="$2" ; shift;;   
    --filter) filter="$2" ; shift;; 
    -h|--help) echo $HELP; exit;;
    (--) shift; break;;
    (-*) echo "$0: error - unrecognized option $1" 1>&2; exit 1;;
    (*) break;;
    esac
    shift
done

# switch to dir
cd $wd
FILES="$wd/$filter" 

# process repos
for f in $FILES
do
  cd "$f"    
  test -d "$f.git/" && echo "Processing $f ..." || echo "$f ist not a GIT repository"
  if [ -d "$f.git/" ];
  then
   git stash save
   git checkout $branch
   git remote show | grep $pull > /dev/null && git pull $pull $branch      
   git remote show | grep $push > /dev/null && git push $push $branch
  fi
  cd ..
done