CWH-PythonBeginner/git at main · gary391/CWH-PythonBeginner · GitHub

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Git is a version control system

1. Easy file recovery
2. Who introduced an issue and when ?
3. roll back to previously state


- snapshot not difference
.git folder - project history - Saves snapshots

- Almost every operation are local
- git has integrity - checksum matching
- git generally only adds data
    - As you make changes to your project, the value in the .git folder keep adding


Workflow:


Q:How to intialize a folder/git repository ?

 - git init
 - This is to allow git to track changes in the folder.

Q: How to add all files into the staging area ?
 - git add --a


Q: git commit
  This will take a snapshot of all the files

Q: How to change the commit author for one specific commit?
https://stackoverflow.com/questions/3042437/how-to-change-the-commit-author-for-one-specific-commit
git commit --amend --author="Gaurav Yadav <gary391@gmail.com>" --no-edit --> This is command to make the change

A-B-C-D-E-F with F as HEAD, and you want to change the author of C and D, then you would
1. git rebase -i <B-commit>
    2. Identify the commit you would like to change in the terminal window
    3. change pick to edit

        pick 1fc6c95 Patch A
        pick 6b2481b Patch B
        pick dd1475d something I want to split
        pick c619268 A fix for Patch B
        pick fa39187 something to add to patch A
        pick 4ca2acc i cant' typ goods
        pick 7b36971 something to move before patch B

        # Rebase 41a72e6..7b36971 onto 41a72e6
        #
        # Commands:
        #  p, pick = use commit
        #  r, reword = use commit, but edit the commit message
        #  e, edit = use commit, but stop for amending
        #  s, squash = use commit, but meld into previous commit
        #  f, fixup = like "squash", but discard this commit's log message
        #  x, exec = run command (the rest of the line) using shell
        #
        # If you remove a line here THAT COMMIT WILL BE LOST.
        # However, if you remove everything, the rebase will be aborted.
        #

        :wq
    4. git commit --amend --author="Gaurav Yadav <gary391@gmail.com>" --no-edit
    5. git rebase --continue
    6. git push -f (Once done push all the changes) - Note if you do a regular push, it will not work.

    https://www.youtube.com/watch?v=3LIr70uVZ_Q&ab_channel=TutorialTim
    a. Download bare respository using  - git clone --bare <Repository Name>
    b. cd
    c. execute the bash script

    #!/bin/sh

    git filter-branch --env-filter '
    OLD_EMAIL="garyrao@bbc.com"
    CORRECT_NAME="gary391"
    CORRECT_EMAIL="gary391@gmail.com"
    if [ "$GIT_COMMITTER_EMAIL" = "$OLD_EMAIL" ]
    then
        export GIT_COMMITTER_NAME="$CORRECT_NAME"
        export GIT_COMMITTER_EMAIL="$CORRECT_EMAIL"
    fi
    if [ "$GIT_AUTHOR_EMAIL" = "$OLD_EMAIL" ]
    then
        export GIT_AUTHOR_NAME="$CORRECT_NAME"
        export GIT_AUTHOR_EMAIL="$CORRECT_EMAIL"
    fi
    ' --tag-name-filter cat -- --branches --tags

    d. git push --force --tags origin 'refs/heads/*'
    e. remove the bare repository using rm -rf <repo>
Q:

Q: How to access multiple github accounts from one computer

### SSH KEYS

1. Generate separate SSH keys
ssh-keygen -t rsa -b 4096 -C "gary391@gmail.com"
save it as id_rsa_<name>