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# Start using Git on the command line
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If you want to start using a Git and GitLab, make sure that you have created an account on GitLab.
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## Open a shell

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Depending on your operating system, find the shell of your preference. Here are some suggestions.
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- [Terminal](http://blog.teamtreehouse.com/introduction-to-the-mac-os-x-command-line) on  Mac OSX

- [GitBash](https://msysgit.github.io) on Windows

- [Linux Terminal](http://www.howtogeek.com/140679/beginner-geek-how-to-start-using-the-linux-terminal/) on Linux

## Check if Git has already been installed

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Git is usually preinstalled on Mac and Linux.
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Type the following command and then press enter:
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```
git --version
```

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You should receive a message that will tell you which Git version you have in your computer. If you don’t receive a "Git version" message, it means that you need to [download Git](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git).
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If Git doesn't automatically download, there's an option on the website to [download manually](https://git-scm.com/downloads). Then follow the steps on the installation window.
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After you finished installing, open a new shell and type "git --version" again to verify that it was correctly installed.
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## Add your Git username and set your email

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It is important because every Git commit that you create will use this information.
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On your shell, type the following command to add your username:
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```
git config --global user.name ADD YOUR USERNAME
```

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Then verify that you have the correct username:
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```
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git config --global user.name
```

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To set your email address, type the following command:
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```
git config --global user.email ADD YOUR EMAIL
```

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To verify that you entered your email correctly, type:
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```
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git config --global user.email
```

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You'll need to do this only once because you are using the "--global" option. It tells Git to always use this information for anything you do on that system. If you want to override this with a different username or email address for specific projects, you can run the command without the "--global" option when you’re in that project.
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## Check your information

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To view the information that you entered, type:
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```
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git config --global --list
```