I am currently collaborating with a few others on a large Java project, and have cloned the repository to work on it from my home PC. I went ahead and changed 2 files within the whole directory/subdirectory structure of this gigantic project, and would like to just push those two files I've edited back into the repository.
Is there a command I can use in order to accomplish this? Thanks.
If you added new files make sure to add them with git add
git commit -a -m "Commit message"
git push
To get any new changes they made ahead of yours you'll need to pull first
git pull
then fix any merge conflicts and commit the merge.
Assuming you committed your change and it's in a branch that already exists on the server, you can simply use git push.
Once you've git cloned the repository, and made changes to files, you can use git status to see what files have changed.
Select changes to commit using git add. When you've selected ('staged') all the changes you wish to commit, git commit them. That will commit to your local repository.
To push the commits to github, use git push.
If you're new to git, I'd very highly recommend you at least browse through the Pro Git book. It's got some good diagrams and explanations for a whole bunch of git topics; I found it very useful. In particular, for this question, look at the 'Recording changes to the repository' and 'Working with remotes' sections.
The StackOverflow Git FAQ / Wiki also has some neat information for common questions; some of those are related to yours, such as this one.
Edit: As an aside, about this part of your question:
... just push those two files I've edited...
Git thinks in terms of commits, not in terms of files. You can't push a subset of files in your repository, because a commit encompasses the entire repository at the time of the commit. git push and other network-type git commands, though, are pretty darn good at working out what they should be sending to the remote repositories. Don't worry, even if the repository is large, if you've changed two source files, a git push won't push every single file back to the remote repository.
git pull origin master - make sure your master branch is up to date with the latest changes in the remote repository defined by origin (frequently github).
git status - show files that you've modified in the branch you are in.
git add . - add the files you've modified to your current branch.
git commit - save changed files to your current branch.
git push origin master - send the changed files in the master branch to the remote repository.
