http://help.github.com/linux-set-up-git/
$ cd ~/.ssh
$ mkdir key_backup
$ cp id_rsa* key_backup
$ rm id_rsa*
$ ssh-keygen -t rsa -C "your_email@youremail.com" 
* Update the github public key

Get a local copy
$ git clone git@github.com:kongxx/garbagecan.git

Commit to local
$ git commit -m 'xxx' <file>

Push to github
$ git push

Update the local
$ git pull