Git (Contd)

Git Commit

• Commit needs the following
  • changes
  • username
  • email
  • message
  • datetime (of commit)

Configuring email and username

• execute the following commands

git config --global user.name <username>
git config --global user.email <emailid>

Initializing the repository

• When we want to create a local repository (when remote doesnot exist)
• Create a new folder

mkdir <folder>

• initailze

cd <folder>
git init

Cloning the repository

• Your organization is already having the code in some remote location (github)
  

Lets focus only on local repo

• Working tree
• When we make changes in the working tree, we have two types of status ()
  • untracked: This file doesnot have any history (new file)
  • Changes not staged for commit: These files have history and now are modified
    
• Staging Area
  
• Now we can commit the changes with a message
  
• Git log
  
• Graph representation
  
• Every commit has a unique commit id

Hashing and Git

• Git uses hashing and to be specific SHA1 hasing algorithms
• A Git commit is sha 1 hash of
  • changes
  • previous commit
  • date time
  • username and email
  • message
• Every file which you add to the history is represented as object and contents are stored with hash id
• Every folder is represented as tree

Commands used sofar

• git config –global
• git init
• git add
• git commit -m
• git status
• git log
• git cat-file -p