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- [Instructor] Whether
you're a professional,

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or an amateur developer,

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you most definitely heard

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about the concept of version control.

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There are tons of tools in the market,

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both commercial and open source.

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And usually you will find things

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like the version control system or VCS,

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or SubVersion for example,

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a concurrent version system or CVS,

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Team Foundation servers.

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And there are tons and tons

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and tons of other ones out there.

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However, there's one that in particular

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is extremely popular nowadays,

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and that is Git, right?

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And you probably have heard of Git

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because of GitHub, right?

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Or GitLab.

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And GitHub is basically, you know,

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a product or an ecosystem

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that was actually acquired by Microsoft.

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And GitLab is actually the
community base, you know,

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I would say open source,
you know, repository.

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However, what I want to actually explain

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is the concept of Git,

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and how to actually interact

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with things like GitHub and GitLab,

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or private repositories,

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and so on, right?

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Now, Git is open source software.

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You can actually download it

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from the link that I'm
highlighting on the screen.

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However, if you're a Linux user,

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you may already have Git out the box,

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you know, install in your system.

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Or you can actually install it

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in operating systems like Debian or Ubuntu

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with a simple apt-get install git, right?

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Or equivalent, depending
on the distribution.

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But what I want to actually go over

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is a few basic commands

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that you actually have to
know for the exam, right?

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For example, you know,

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to create an empty Git repository

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in a specific directory,

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you can actually just run git init, right?

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And that with no arguments will initialize

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the current directory as a Git repository.

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However, you can also do git init,

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and then specify the directory itself.

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You also have git clone,

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and that clones the repository

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located in a specific,
you know, in a repo,

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whether it's GitHub or GitLab,

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or a private GitLab repository, and so on.

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You also have configuration parameters.

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And it's actually, you know,

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those are actually set up

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by the git config command, you know,

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that you can actually use

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for things like defining the author name,

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and setting global configuration flags,

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setting even your GPG or PGP key

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to sign your commits, and so on.

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You also have the git add command,

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that stages all the
changes in the directory

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that you actually initiated
for the next commit.

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And then, you also have
the git commit command,

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that basically commit the stage snapshot,

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but instead of actually
launching a text editor,

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you can actually use
the -m for the message,

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and that will actually, you know,

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each commit will actually have to have

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at least some description

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of what the commit is all about.

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And that's actually the
message in this example.

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Now you also have the git status,

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which actually list which files are stage,

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unstage, or untracked.

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You have logging capabilities.

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And to display the entire commit history,

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you can actually use the git log.

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You can also use the git diff

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to show the unstage changes

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between your index and
your working directory.

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Now there's a concept
of branches, of course,

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in many development, you know, activities.

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And to list all the
branches in your repository,

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you can actually use
the git branch command.

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And to check out,

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or create a new branch,

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you can actually use the git checkout

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followed by the branch name.

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There's also the concept of merging

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and pull request, right?

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So if you actually want

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to push a new change to a repository,

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you can actually do a git push, you know,

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to push that branch, or you know,

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that change to a remote branch,

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whether it's the master
branch or a specific one.

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Or you can actually do a pull request,

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and basically what it does

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is fetch the specify remote copy

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of the current branch,

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and immediately merges to a local copy.

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And then it actually, you know,

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provides the ability

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for you to then pull request.

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And a pull request,

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then it's approved by
whoever the administrator,

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or the specific user of, you know,

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the author of that GitHub repository.

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Now, if I actually want
to obtain information,

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things actually changes
in that repository,

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and keep up to date,

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I can do a git fetch, right?

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To fetch a specific branch,

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or, you know, pretty much everything

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if you actually want to fetch
all the remote references.

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And then you can do a git pull

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to fetch the specified remote copy

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of the current branch,

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and immediately merge it

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to your local copy as well

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to keep track of those changes, right?

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So of course, as you
actually make changes,

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you can actually use the commands

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that I mentioned to you before,

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like git add, and git push

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to push any changes to a specific branch,

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or to the master branch in that case.

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Now the cool thing is that,

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DevNet has several labs

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that you can actually
complete in your own.

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And in there, they not only provide

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an introduction to Git,

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but also, there's several repositories.

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Like for example,

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they have DevNet Express for DNA,

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cloud collaboration, data
center infrastructure,

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that actually you can clone,

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and then use for your reference,

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and also, you know,

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to practice your skills as well, right?

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So definitely take advantage

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of all these labs and tutorials

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that are available for free

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from Cisco at DevNet.