I forked a project on github, made some changes, so far so good.
In the meantime, the repository I forked from changed and I would like to get those changes into my repository. How do I do that ?
Generally git pull is enough, but I'm not sure what layout you have chosen (or has github chosen for you).
Assuming their updates are on master, and you are on the branch you want to merge the changes into.
git remote add origin https://github.com/<github-username>/<repo-name>.git
git pull origin master
Also note that you will then want to push the merge back to your copy of the repository:
git push origin master
You have to add the original repo as an upstream.
It is all well described here: https://help.github.com/articles/fork-a-repo
git remote add upstream https://github.com/octocat/Spoon-Knife.git
git fetch upstream
git merge upstream/master
git push origin master
You need to add the original repository (the one that you forked) as a remote.
git remote add github (clone url for the orignal repository)
Then you need to bring in the changes to your local repository
git fetch github
Now you will have all the branches of the original repository in your local one. For example, the master branch will be github/master. With these branches you can do what you will. Merge them into your branches etc
For Linux:
git add *
git commit -a --message "Initial Push All"
git push -u origin --all
来源：https://stackoverflow.com/questions/4313125/how-to-sync-with-a-remote-git-repository