Keep a set of clones of your github repos up-to-date.

refresh-backup.sh

#!/bin/bash
# Keep a set of clones of your github repos up-to-date. Run this in a
# directory of its own. It will clone (or update) your github repos into
# subdirectories, one per repo. Written on OS X Leopard.
# Depends on /usr/bin/xpath.
# Make sure you set githubuser, below, to the correct value :-)

githubuser=tonyg

for repo in $(curl http://github.com/api/v1/xml/$githubuser | xpath '//repository/name' 2>/dev/null | sed -e 's:><:> <:g')
do
    repo=$(echo $repo | sed -e 's:<name>::' -e 's:</name>::')
    echo $repo ...
    if [ -d $repo ]
    then
	(cd $repo; git pull)
    else
	git clone git://github.com/$githubuser/$repo.git
    fi
done