Staging and Remotes

to compare

$ git diff
$ git diff --staged

to unstage

$ git checkout (filename)
$ git checkout -- cats.html index.html
$ git reset ostrich.html

to stage and commit, modify and commit

$ git commit -a -m "file updated"
$ git commit --amend -m "xxxx"

undo the commit

$ git reset --soft HEAD^
$ git reset --hard HEAD^
$ git reset --hard HEAD^^
$ git reset HEAD LISENCE

to add a remote

$ git remote add origin https://github.com/XXX/xx.git
$ git remote set-url origin https://xxxx
$ git remote -v
$ git push -u origin master
$ git pull