[PDF] [PDF] GIT i - Tutorialspoint

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This tutorial explains how to use Git for project version control in a distributed This tutorial will help beginners learn the basic functionality of Git version control

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To start version controlling edited existing (new) files (tracking and commiting to local repository): $ git add filename [start tracking new/edited filename]

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The aim here is not to tell you every single Git command in existence or even to The aim is to familiarise you with the principles of version control, some good 

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learn and to use, but, despite that, Git is the favorite option for developers, which is quite The one we mentioned, the manual process, can be considered as a

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Combine work of multiple collaborators

Understand changes

Support incremental development

Compare and revert to earlier versions

Backup

Parallel versions

Document development (for other developers and yourself, not for users) → version control is awesome. Use it all the time. A distributed version control system (VCS) whose primary user interface is the Unix command line. It

basically keeps a "non-human-readable" database of the files you put under version control ("track") and

provides commands to access and update that database. Graphical user interfaces, integration in Integrated Design Environments, and web platforms GitHub/GitLab/... have formed around the Git core software. The aim here is not to tell you every single Git command in existence or even to teach you all the

functionality. The aim is to familiarise you with the principles of version control, some good practices, and

get you started on the practical matters.

We're going to walk you through an example. The things we show you here will teach you all you need to

know to collaborate on your team project using Git.

To initialise a new local repository do

Software version control

Stefan Richter (DESY, MCnet)

Why version control?

What is Git?

Practical introduction by example

Setting up

>>> mkdir myrepo && cd myrepo >>> git init

Now try ls -a. Notice anything interesting?

You can also clone existing repositories from a (usually remote) different location. Git supports this via

http(s), ssh, etc. Please create an account on GitLab (http://gitlab.com) and create a public repository called myrepo. Then clone it to your local machine by doing >>> git clone https://gitlab.com//myrepo.git >>> cd myrepo

At this point you could set some configurations.

>>> git config core.editor "emacs -nw" # or your favourite light-weight editor >>> git config color.ui true # makes life more fun >>> git config --list # check that it worked! To make settings for all repositories on your computer, add the flag --global after git config. You should also set your user name and email like this: >>> git config user.name "Stefan Richter" >>> git config user.email "stefan.richter@example.com"

These will be associated with your commits.

Your first best friend in Git is the command status: >>> git status

It shows you the files in the repository, both tracked and untracked by Git. Use this command all the time to

know what's going on. We're going to create a remote repository on GitLab and clone it.

Monitoring 1

Commit = saved snapshot of tracked files. You can always revert to a commit! You can also compare them, share them, ...

Commits are cheap. What do I mean by that?

Committing in Git works in two steps. First modified or untracked files are "registered" for the next commit

by using add. This is called staging. The staged files are then committed with commit:

Image from https://git-scm.com (license)

Note: most other VCSs (e.g. Mercurial and SVN) don't have this two-step structure. They don't have a staging area. >>> git add # file is now staged for commit

Note: in Mercurial and SVN, add is only used to put a previously untracked file under version control. In

Git, it has a wider meaning!

>>> git commit Then write a commit message. We'll give you hints for what is a good message.

Committing

Good commit messages matter! Here are some good recommendations (bedtime reading for you?). Commits are identified by a unique hexadecimal number (a hash). Your second best friend is diff. It shows you changes (differences) between versions. Without arguments, it shows all changes made to tracked files in the repository since the last commit. >>> git diff >>> git diff (git diff can also be used to show differences between arbitrary revisions. You can google it.) Use >>> git log to see the commit history on your current branch. I use git log - a lot to only show the last commits, e.g. >>> git log -3 What happens if you track files other than flat text files? Create a hidden file .gitignore containing file patterns you want Git to ignore. These files won't show up in git status. E.g. *.log *.tmp test_data/ my_personal_notes.txt

To check which branch you are on:

Monitoring 2

A question and a suggestion:

Branches

>>> git branch # see where we are! >>> git branch -a # what's the difference?

Create a new branch:

>>> git branch dev1 # dev1 is the name of the branch

Switch to the branch using checkout:

>>> git checkout dev1 >>> git branch # see where we are! To merge my changes into another branch (let's say, master): >>> git checkout master >>> git merge dev1

See what our remote is:

>>> git remote # what's our remote >>> git remote -v # some more info

To update the local repository (pull changes):

>>> git pull

To update the remote repository (push changes):

>>> git push origin master

When pushing the first time, do

A quick word on origin and master: these are the default names of the remote repository and the >>> git push -u origin master # -u tells the remote to track this branch in the future

Working with remote repositories: sharing

first branch. They are not magical keywords and you could use different names. However, don't. Unless you

have a good reason.

A common workflow that your team could adopt:

Image from https://git-scm.com (license).

Personally I like a model where every developer has one personal development branch on the shared repository, named after them (e.g. stefan in my case). (Everyone can have as many additional local

branches as they like, but they're not tracked in the shared repository.) People push to their own branch,

then request a merge into the master/release/common development/whatever branch. At this point, the others review the code to be merged for correctness, understandability, maintainability, style & conventions, robustness, resource effectiveness. When any necessary changes have been made/commited/pushed, the merge request is accepted.

Git is widely used and has many powerful features, but it also has some annoying downsides. You might

already have noticed that it's sometimes quite unintuitive and difficult to use...

In fact, a tutorial like this glosses over the total mess that you will from time to time end up in with

Git!

Here is a good post about problematic things in Git: https://stevebennett.me/2012/02/24/10-things-i-hate-

about-git. It is very instructive to read it! You will realise that sometimes it's not you who's crazy, it's Git.

There are good alternatives to Git: Mercurial (hg), which is "better", and Bazaar (bzr), which I know

nothing about.

Git's not perfect...

SVN is an older central (i.e. not distributed) VCS and not as powerful as Git and Mercurial. I don't use it

voluntarily. No, Obama! Never ever use git rebase (or git cherry-pick)! It rewrites repository history and can even create loss of commited information. Here's somebody who disagrees with me.

Finally

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