DevOps Classroom Series – 18/Nov/2021

Git

• Git is a free & open source distributed version control system, designed & Implemented by Linus Torvalds to handle from small to very large projects with speed and effeciency
• Installing Git:
  • Windows: Refer Here
  • Mac: brew install git
  • Linux:
    • Debian: sudo apt install git -y
    • RedHat: sudo yum install git -y
• Configuring git

git config --global user.name 'qtdevops'
git config --global user.email 'qtdevops@gmail.com'

• Tip for git commands:
  • Try using any cheatsheet which you like Refer Here for cheatsheet from atlassian
• Creating a Repository using Git:
  • Navigate to any directory in your system and create a folder called as helloworld
  • Initialize a repository
• Three Areas of Git
  • Intro
  • Commit Workflow
    • Demonstration:
      • Lets create a new file called as ‘Readme.md’ (in linux/mac use touch Readme.md)
      • Now we had made changes in the working tree. Lets check the status using git status
      • Now lets add the change to the staging area
      • To commit a version into git repository git needs
        • commit message => This describes the purpose
        • commit author username => username will be recorded in the version history
        • commit author email => email of the user will be recorded in the history
        • Datetime of commit => When the commit was made
      • In the git configuration we have already configured username and email
      • Now lets do the commit git commit -m <message for the version to be created>
      • Now lets look at history git log
      • Git log will show
        • commit: This is unique commit id which represents a version
        • Author: The author of the commit
        • Date: Date time of the commit
      • Now lets make a change in the working tree. Add some text to Readme.md file
      • Lets add the change to the staging area
      • Now lets try to commit the changes from staging area
  • Understading HEAD pointer
    • HEAD is a pointer which represents the contents of working tree
    • Now lets move head to the previous commit git checkout <previous commit id>
    • Now lets move the HEAD back to latest version git checkout master
  • Exercise:
    • Initialize a new Repository in your system
    • Create a new file and create a new version in the repo
    • As a second change try to create a directory called as src and create a new version in the repo