untung99.homes: Git Tutorial Getting started with Git

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Versions

Create your first repository, then add and commit files

At the command line, first verify that you have Git installed:

On all operating systems:

git --version
 

On UNIX-like operating systems:

which git
 

If nothing is returned, or the command is not recognized, you may have to install Git on your system by downloading and running the installer. See the Git homepage for exceptionally clear and easy installation instructions.

After installing Git, configure your username and email address. Do this before making a commit.

Once Git is installed, navigate to the directory you want to place under version control and create an empty Git repository:

git init
 

This creates a hidden folder, .git , which contains the plumbing needed for Git to work.

Next, check what files Git will add to your new repository; this step is worth special care:

git status
 

Review the resulting list of files; you can tell Git which of the files to place into version control (avoid adding files with confidential information such as passwords, or files that just clutter the repo):

git add   <...>
 

If all files in the list should be shared with everyone who has access to the repository, a single command will add everything in your current directory and its subdirectories:

git add .
 

This will “stage” all files to be added to version control, preparing them to be committed in your first commit.

For files that you want never under version control, create and populate a file named .gitignore before running the add command.

Commit all the files that have been added, along with a commit message:

git commit -m "Initial commit"
 

This creates a new commit with the given message. A commit is like a save or snapshot of your entire project. You can now push, or upload, it to a remote repository, and later you can jump back to it if necessary.
If you omit the -m parameter, your default editor will open and you can edit and save the commit message there.

Adding a remote

To add a new remote, use the git remote add command on the terminal, in the directory your repository is stored at.

The git remote add command takes two arguments:

1. A remote name, for example, origin
2. A remote URL, for example, https:///user/repo.git

    git remote add origin https:///owner/repository.git
 

NOTE: Before adding the remote you have to create the required repository in your git service,
You’ll be able to push/pull commits after adding your remote.

Clone a repository

The git clone command is used to copy an existing Git repository from a server to the local machine.

For example, to clone a GitHub project:

cd 
git clone https://github.com/username/projectname.git
 

To clone a BitBucket project:

cd 
git clone https://yourusername@bitbucket.org/username/projectname.git
 

This creates a directory called projectname on the local machine, containing all the files in the remote Git repository. This includes source files for the project, as well as a .git sub-directory which contains the entire history and configuration for the project.

To specify a different name of the directory, e.g. MyFolder :

git clone https://github.com/username/projectname.git MyFolder
 

Or to clone in the current directory:

git clone https://github.com/username/projectname.git .
 

Note:

1. When cloning to a specified directory, the directory must be empty or non-existent.

2. You can also use the ssh version of the command:

   git clone git@github.com:username/projectname.git
    

The https version and the ssh version are equivalent. However, some hosting services such as GitHub recommend that you use https rather than ssh .

Git Installation

Let’s get into using some Git. First things first—you have to install it. You can get it a number of ways; the two major ones are to install it from source or to install an existing package for your platform.

Installing from Source

If you can, it’s generally useful to install Git from source, because you’ll get the most recent version. Each version of Git tends to include useful UI enhancements, so getting the latest version is often the best route if you feel comfortable compiling software from source. It is also the case that many Linux distributions contain very old packages; so unless you’re on a very up-to-date distro or are using backports, installing from source may be the best bet.

To install Git, you need to have the following libraries that Git depends on: curl, zlib, openssl, expat, and libiconv. For example, if you’re on a system that has yum (such as Fedora) or apt-get (such as a Debian based system), you can use one of these commands to install all of the dependencies:

$ yum install curl-devel expat-devel gettext-devel \
  openssl-devel zlib-devel

$ apt-get install libcurl4-gnutls-dev libexpat1-dev gettext \
  libz-dev libssl-dev
 

When you have all the necessary dependencies, you can go ahead and grab the latest snapshot from the Git web site:

http://git-scm.com/download
Then, compile and install:

$ tar -zxf git-1.7.2.2.tar.gz
$ cd git-1.7.2.2
$ make prefix=/usr/local all
$ sudo make prefix=/usr/local install
 

After this is done, you can also get Git via Git itself for updates:

$ git clone git://git.kernel.org/pub/scm/git/git.git
 

Installing on Linux

If you want to install Git on Linux via a binary installer, you can generally do so through the basic package-management tool that comes with your distribution. If you’re on Fedora, you can use yum:

$ yum install git
 

Or if you’re on a Debian-based distribution like Ubuntu, try apt-get:

$ apt-get install git
 

Installing on Mac

There are three easy ways to install Git on a Mac. The easiest is to use the graphical Git installer, which you can download from the SourceForge page.

http://sourceforge.net/projects/git-osx-installer/

Figure 1-7. Git OS X installer.
The other major way is to install Git via MacPorts (http://www.macports.org). If you have MacPorts installed, install Git via

$ sudo port install git +svn +doc +bash_completion +gitweb
 

You don’t have to add all the extras, but you’ll probably want to include +svn in case you ever have to use Git with Subversion repositories (see Chapter 8).

Homebrew (http://brew.sh/) is another alternative to install Git. If you have Homebrew installed, install Git via

$ brew install git
 

Installing on Windows

Installing Git on Windows is very easy. The msysGit project has one of the easier installation procedures. Simply download the installer exe file from the GitHub page, and run it:

http://msysgit.github.io
 

After it’s installed, you have both a command-line version (including an SSH client that will come in handy later) and the standard GUI.

Note on Windows usage: you should use Git with the provided msysGit shell (Unix style), it allows to use the complex lines of command given in this book. If you need, for some reason, to use the native Windows shell / command line console, you have to use double quotes instead of single quotes (for parameters with spaces in them) and you must quote the parameters ending with the circumflex accent (^) if they are last on the line, as it is a continuation symbol in Windows.

Learning about a command

To get more information about any git command – i.e. details about what the command does, available options and other documentation – use the --help option or the help command.

For example, to get all available information about the git diff command, use:

git diff --help
git help diff
 

Similarly, to get all available information about the status command, use:

git status --help
git help status
 

If you only want a quick help showing you the meaning of the most used command line flags, use -h :

git checkout -h
 

Set up SSH for Git

If you are using Windows open Git Bash.
If you are using Mac or Linux open your Terminal.

Before you generate an SSH key, you can check to see if you have any existing SSH keys.

List the contents of your ~/.ssh directory:

$ ls -al ~/.ssh 
# Lists all the files in your ~/.ssh directory
 

Check the directory listing to see if you already have a public SSH key. By default the filenames of the public keys are one of the following:

id_dsa.pub
id_ecdsa.pub
id_ed25519.pub
id_rsa.pub
 

If you see an existing public and private key pair listed that you would like to use on your Bitbucket, GitHub (or similar) account you can copy the contents of the id_*.pub file.

If not, you can create a new public and private key pair with the following command:

$ ssh-keygen
 

Press the Enter or Return key to accept the default location.
Enter and re-enter a passphrase when prompted, or leave it empty.

Ensure your SSH key is added to the ssh-agent. Start the ssh-agent in the background if it’s not already running:

$ eval "$(ssh-agent -s)"
 

Add you SSH key to the ssh-agent. Notice that you’ll need te replace id_rsa in the command with the name of your private key file:

$ ssh-add ~/.ssh/id_rsa
 

If you want to change the upstream of an existing repository from HTTPS to SSH you can run the following command:

$ git remote set-url origin ssh://git@bitbucket.server.com:7999/projects/your_project.git
 

In order to clone a new repository over SSH you can run the following command:

$ git clone ssh://git@bitbucket.server.com:7999/projects/your_project.git
 

Setting up the upstream remote

If you have cloned a fork (e.g. an open source project on Github) you may not have push access to the upstream repository, so you need both your fork but be able to fetch the upstream repository.

First check the remote names:

$ git remote -v
origin    https://github.com/myusername/repo.git (fetch)
origin    https://github.com/myusername/repo.git (push)
upstream  # this line may or may not be here
 

If upstream is there already (it is on some Git versions) you need to set the URL (currently it’s empty):

$ git remote set-url upstream https://github.com/projectusername/repo.git
 

If the upstream is not there, or if you also want to add a friend/colleague’s fork (currently they do not exist):

$ git remote add upstream https://github.com/projectusername/repo.git
$ git remote add dave https://github.com/dave/repo.git
 

Setting your user name and email

You need to set who you are *before* creating any commit.  That will allow commits to have the right author name and email associated to them.
 

It has nothing to do with authentication when pushing to a remote repository (e.g. when pushing to a remote repository using your GitHub, BitBucket, or GitLab account)

To declare that identity for all repositories, use git config --global
This will store the setting in your user’s .gitconfig file: e.g. $HOME/.gitconfig or for Windows, %USERPROFILE%\.gitconfig .

git config --global user.name "Your Name"
git config --global user.email mail@example.com
 

To declare an identity for a single repository, use git config inside a repo.
This will store the setting inside the individual repository, in the file $GIT_DIR/config . e.g. /path/to/your/repo/.git/config .

cd /path/to/my/repo
git config user.name "Your Login At Work"
git config user.email mail_at_work@example.com
 

Settings stored in a repository’s config file will take precedence over the global config when you use that repository.

---

Tips: if you have different identities (one for open-source project, one at work, one for private repos, …), and you don’t want to forget to set the right one for each different repos you are working on:

• Remove a global identity

  git config --global --remove-section user.name
  git config --global --remove-section user.email
   

That way, if you forget to set your user.name and user.email for a given repository and try to make a commit, you will see:

no name was given and auto-detection is disabled
no email was given and auto-detection is disabled
 

Sharing code

To share your code you create a repository on a remote server to which you will copy your local repository.

To minimize the use of space on the remote server you create a bare repository: one which has only the .git objects and doesn’t create a working copy in the filesystem. As a bonus you set this remote as an upstream server to easily share updates with other programmers.

On the remote server:

git init --bare /path/to/repo.git
 

On the local machine:

git remote add origin ssh://username@server:/path/to/repo.git
 

(Note that ssh: is just one possible way of accessing the remote repository.)

Now copy your local repository to the remote:

git push --set-upstream origin master
 

Adding --set-upstream (or -u ) created an upstream (tracking) reference which is used by argument-less Git commands, e.g. git pull .

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