Here's my explanation of the post from the command line with screenshots
First, you need to clone the git blog repo so you can access, edit and push files. To do that, enter the code in the screenshot, but substituting your username for where I entered "jkgeer".
Now you need to access the fall2013 directory. If you type ls from your command line you should see new files added to your home directory. Now cd to the fall2013 directory, type ls and look at the files within that directory. Now, because you want to create/edit a post from the command line, you need to access the _posts directory, which you would do by typing 'cd _posts'. Once you're there, type ls and you should see whichever posts were present the last time you forked the silshack github site to your personal one.
Now, you need to use the Nano text editor to edit an existing post and change it to suit this assignment. To do this you type nano "exact post file name". So for instance, I typed "nano 2013-10-14-jkgeer-commandline-post.md". Keep in mind once you've typed far enough on the file name to distinguish it from all other files you can press TAB to auto-complete the file title.
You should see the basic interface of the Nano text editor. Now you're going to include your username, the category and the post title. From there, simply edit the content to include what you need to include, then press Ctrl + O to save and rename the file to an appropriate name
At this point you will type 'git status' and see that the file you've just edited is 'untracked.' So from here, type "git add 'file name here'. Typing git status again should have the file as green and ready to be committed. So type "git commit -m "commit message belongs here"
Now you've committed your post, and you need to push it to your github site So type "git push origin gh-pages" to put it under the gh-pages branch of your github site. From there you're going to access Github and open a pull request!
Congrats, you're done.