git init

mkdir git
cd git
git init
touch readme.txt
git add readme.txt
git commit -m "init git and readme.txt"
git remote add origin https://github.com/test/test1
git push origin master
touch 1.txt
touch 2.txt
git add *.txt
git commit -m "test commit *.txt "
git push origin master
git rm 2.txt
git commit -m "delete 2.txt "
git push origin master

sed '1 i hello git ' readme.txt >readme.txt
git add readme.txt
git commit -m "modify readme.txt"
git push origin master