What is Git?

Git is the most popular version-control system. There are other version-control systems such as Subversion.

What is version-control system?

It saves -

• What changes was made to the source code?

• Who made the changes?

• When was the changes made?

Why we use a version-control system?

• If an error was introduced to the source code, we can go to a previous version of code which did not have that error.

• If many people are working on the same source code, we can manage who makes what changes to the code.

Download and Update Git

• Download: Git - Downloads (git-scm.com)

• Update: git clone https://github.com/git/git (Terminal Command)

Start Git

• Run git init

• This will create a folder: .git

• This is where history is saved.

Git Commands

• git status: See what items are untracked/staged.

  • Untracked: Item is not on staging area.

    • Staging Area: Git can only process items on the staging area. Items must be put on the staging area before any work can be done.

  • Staged: Item is in staging area.

• git add . : Add items to the staging area

  • '.' means all items in the current directory.

  • Replace '.' with folder name to stage a particular item.

• git commit -m "message": Store items in staging area to history.

• git restore --staged .: Remove item from staging area to untracked.

• git log: See history.

• git reset fea46a6ef9c48a621b941cf04802930f8635e480: Go back to a particular commit. All commits have a code associated with it which can be seen when git log is run.