This is required to make the numbering scheme work.Įvery commit holds (indirectly) a full snapshot of every file. This trick is literally mathematically impossible to keep up forever, and someday Git will fail, but by making the hash ID huge, we can hope that the day will be so many billions of years in the future that we won't care because we're all long since dead. Git somehow manages to do this across all Git repositories that exist anywhere in the universe, without having any of the repositories talk to any other repository. That number was first used for that commit, and if you have a commit with that number in your repository, it's required that it be that commit. The number here is unique: no other commit, in any Git repository anywhere in the universe, is ever allowed to use that number again. Git calls this a hash ID, or more formally an object ID or OID. For instance, 9bf691b78cf906751e65d65ba0c6ffdcd9a5a12c is a commit in a Git repository for Git. Is numbered, with a huge and random-looking number, expressed in hexadecimal. But Git is all about the commits, so we need to know what a commit is, and what it does for us. Branches-or more precisely, branch names-come into the picture because the true names of individual commits are horrible, and humans really don't want to (and should not) use them directly, most of the time. Files come into the picture because commits would be useless without them, so each commit holds files. The first thing you should have been told about Git (but probably weren't) is that Git is not about files, and not about branches: Git is all about commits. It's not that running the two commands that git pull combines for you is any easier, but rather, that when you do use the two commands, you get a better sense of what's going on. The surprise should be that you didn't get merge commits before! I personally believe that Git newbies should not be told to use git pull. You should therefore expect git pull to make merge commits. It will probably take you about 5-10 hours to go through one of the two paths, but your mileage may vary.Let's start with this: git pull literally means run git fetch, then run git merge or some other second command of my choice. This course tries to be as concise as possible. However, most of the knowledge that you gain in this course applies to Git itself, and you can apply this knowledge to other hosted Git providers (such as GitHub). Bitbucket is free for teams of up to 5 people, including private repositories. This course uses Bitbucket () as the hosted provider for remote Git repositories. If you use the command line path through the course, you can also use Linux. You can watch the videos and take the quizzes from your phone if you want, but the hands-on labs require you to have a Windows or Mac computer. Besides, repetition is good for learning :) Eventually, you might want to go through both paths, so that you can decide which tool to use for specific tasks. If you are not experienced with a command line, we highly suggest that you go through the Sourcetree path. One path assumes that you have experience using a command line interface, and the other path uses the Sourcetree graphical client. This is especially true if you currently "know just enough Git to be dangerous". This course assumes no previous knowledge of Git, but if you do have experience with it, you may find this course to be both useful and challenging. In this course, you will not learn everything there is to know about Git, but you will build a strong conceptual understanding of the technology, and afterward will be able to confidently dig deeper on any topic that interests you. You could also use Git to manage the many continuously improving revisions of that book that you are writing. It is a core component of DevOps, continuous delivery pipelines and cloud-native computing. It is used by most major technology companies, and is assumed knowledge for many modern programming and IT jobs. This allows the team to continuously improve its product. Git manages team files for large and small projects. Git is open source software originally created by Linus Torvalds. The Version Control with Git course provides you with a solid, hands-on foundation for understanding the Git version control system.
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