example.sh

#! /bin/sh
# Script to provide answer for question:
# http://stackoverflow.com/questions/5149872/how-to-git-remote-add-and-track-a-branch-in-the-same-filesystem

echo create origin
mkdir origin
cd origin/
git init --bare
cd ..

echo clone 'a' and add some content
git clone origin/ a
cd a
echo hi there > hello
git add hello
git commit -m'first commit'
git push origin master 

echo clone 'b' and add more content on new branch
cd ..
git clone origin/ b
cd b
git checkout -b z
echo new guy reporting in >> hello 
git commit -am "new recruits"

echo Add 'b' as a remote to 'a'
cd ../a
git remote add b ../b
git fetch b
git branch
git checkout  b/master 
git checkout -t b/z
git branch