Pull all repos in the current directory

update.sh

#!/bin/bash
stash_name="wip"

echo "> Updating master on all git repositories in the current directory"
for dir in */
do
	if [ -d ${dir}/.git ]; then
		cd ${dir}
		stashed=false

		echo "----------------------------------------------------"
		echo "- Processing ${dir}"
		echo "----------------------------------------------------"

		current_branch=$(git symbolic-ref --short HEAD)

		# If git status has any output then we need to stash our changes
		# so we can restore them after 
		if [[ -n $(git status -s) ]]; then
			echo "> Saving WIP changes"
			git stash save ${stash_name}
			stashed=true
		fi

		# If we're not on master, checkout master
		if [[ ${current_branch} -ne "master" ]]; then
			echo "> Checking out master"
			git checkout master
		fi

		echo "> Pulling master"
		git pull origin master

		# If we've moved branch, checkout the branch we started on
		if [[ $(git symbolic-ref --short HEAD) -ne ${current_branch} ]]; then
			git checkout ${current_branch}
		fi

		# If we stashed changes previously, restore them
		if [[ ${stashed} = true ]]; then
			echo "> Restoring WIP changes"
			git stash pop stash^{/${stash_name}}
		fi

		cd - > /dev/null # Leave the repo
	fi
done

I've added some more bits to the original gist but it still accepts no parameters. It should now stash any changes you have, checkout the master branch if not already checked out, pull from origin and restore your branch & changes once finished