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The course shows how to use Git, the popular open-source version control software, to manage changes to source code and text files. Using a step-by-step approach, author Kevin Skoglund presents the commands that enable efficient code management and reveals the fundamental concepts behind version control systems and the Git architecture. Discover how to track changes to files in a repository, review previous edits, and compare versions of a file; create branches to test new ideas without altering the main project; and merge those changes into the project if they work out. The course begins by demonstrating version control in a single-user, standalone context, before exploring how remote repositories allow users to collaborate on projects effectively.
In the last movie, we created a new branch called new feature, but we haven't switched to it yet. The currently checked out branch is still master, and we know that because we can say git branch, and it gives us a list of the branches and puts some asterisks next to master to let us know that that's still the currently checked out branch, that's what's in our working directory. We saw that we can also take a look at the .git file to see where the HEAD points, and we can see that it also points to the master branch as well right now. So let's see how we check out the new branch.
We do that by checking out the branch, so git checkout is the command that we're going to want, git checkout followed by the name of the branch, git checkout new_feature. And we hit Return, it comes up and tells us that it switched to the branch new feature. Git branch now confirms that we've made the switch, and if we take a look at cat .git/HEAD, we'll see that it also now points to the new_feature branch instead. Now at this point, they both point to the same commit. We haven't made any new changes to master, we haven't made any new changes to new feature, so the tips of those still are absolutely identical.
If we switch between them, no files change in our working directory. Let's add a commit to new feature. Let's just open up index.html, and where it says Welcome to Explore California in the title, let's just add Affordable Outdoor Tours, Save that, git status. We can see that it's here and our changes are not staged for commit. I'm going to commit it, and I am going to use the -a option, which will take all of the changes that are in my not staged for commit, and commit them all at once, and automatically add them as well as commit them, and let's call this modified title of index.html.
So now we have that commit made. Let's take a look, git log --oneline. We can see it, Modified title of index.html, here is the commit number, dc9c83c, so now let's do git checkout of master. Switch back to the branch master, we can confirm that with the git branch. Now let's do git log --oneline, oop, typo there. Now you can see that it's not there anymore. 380f is the last one, which was the second to last one here.
So we have a new commit that's on one and not the other. And now that we're on master, let's go back and take a look at index.html. Welcome to Explore California, let's close that file up. Let's switch our branch again, git checkout new_ feature, switch back to the branch new_feature. Let's open up index.html again. Notice that it changes back again, this is the fast context switching that I was talking about. It's that easy to just swap out all the files and folders in your working directory just by typing checkout a different branch.
In the next movie, we're going to see how we can both create a branch and check it out at the same time.
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