Update in each sub git folder

update.sh

#!/bin/bash

git submodule foreach --recursive 'git fetch origin && git checkout master && git reset --hard origin/master'

# Uncommited Changes - Exit script if there uncommited changes
if ! git diff-index --quiet HEAD --; then
	echo "There are uncommited changes on this repository."
	exit 1
fi

# Remote exists - Exit script if remote does not exist
git ls-remote --exit-code ${remote} >/dev/null 2>&1
if [ $? -ne 0 ]
then
	echo "Remote ${remote} does not exist"
    exit 1
fi

# Branch exists - Exit script if local branch does not exist
git rev-parse -q --verify ${branch} >/dev/null 2>&1
if [ $? -ne 0 ]
then
    echo "Branch ${branch} exists"
fi