GIT Commands reference for DevOps Engineer

Dear DevOps Engineer!! this post is full of experimenting with git commands running most of them on the 'Git Bash' window in my laptop. I've collected three things about each git command.

• git command syntax
• What this git command will do - short descriptions
• An example command that I've executed
• Screenshot of that command execution

How do I Start a Fresh repository in Git CLI(local repo)?

You need to create a folder where you would like to start your coding project. The code can be web-site related where you can have multiple directories involved such as HTML files into a folder, all images to be used in the website in a folder, CSS files into a folder, etc. First, make the folder structure for you project then at the root of the project need to initialize the project.  To create empty repo or re-initializing a repo

Syntax :

git init

Note: It is always better to have a fresh directory created and then run the above command to initialize a local Git repository.

git init example

Getting a remote repository to your git client - Local system/Laptop

You can have the remote repository either public or private teams on the following SCM clouds:

1. GitHub 
2. GitLab
3. BitBucket

git clone Syntax:

git clone ssh://git@github.com/[username]/[repository-name].git

Create a local copy of a remote repository of GitHub or Gitlab. Make sure that you're doing first time in that folder, it should not have the same repo that means if your re-run the same command it cannot work.

Please make sure you have the correct access rights and the remote repository exists

Example of using gitlab URL:

 git clone https://github.com/BhavaniShekhar/vtdevops2021feb.git

Vybhava : git clone 

Syntax:

git commit -m "[commit message]"

commit changes
Example:

git commit -m "some message"

git commit command

Syntax:

git checkout -b [branch name origin/[branch name]

Clone a remote branch and switch to it
Example:

git checkout -b feature2

Differences between git checkout & switch command

Syntax:

git checkout [branch name]

Switch to a branch
Example:

git checkout

git checkout command

Syntax :

git checkout -

Switch to the branch last checked out
Example :

git checkout -

git last checkout command

Syntax:

git checkout -- [file-name.txt]

Discard changes to a file on which you are worked recently.
Example:

Syntax:

git push origin [branch name]

push to a branch to your remote repository
 Example:

git push origin slave

git push command

Syntax:

git push -u origin [branch name]

push changes to remote repository (and remember the branch)
Example:

git push -u origin feature1

git push origin command

Syntax:

git push

push changes to remote repository (remembered branch)
Example:

git push

git push command 

Syntax:

git push origin --delete [branch name]

delete a remote branch
 Example:

git push origin --delete feature3

git remote branch delete oush command

git pull command

Syntax:

git pull origin [branch name]

update local repository to the newest commit
Example:

git pull

git pull command

pull changes from remote repository Example:

git pull origin newbranch2

git remote

Syntax:

git remote add origin ssh://git@github.com/[username]/[repository-name].git
    or
 git remote set-url origin ssh://git@github.com/[username]/[repository-name].git

add a remote repository Example 1:

git remote add origin git@gitlab.com:gitops4/docker-exercises.git

set a repository's origin branch to ssh Example 2:

git remote set-url origin git@gitlab.com:gitops4/docker-exercises.git

git log

The syntax for the git log command is:

git log [--summary] [--oneline]

view changes
Example:

git log

git log command

view changes made to files or directory in (detailed)
Example:

    git log --summary

git log summary command

view changes(briefly)
Example:

    git log --oneline

git log oneline command

Syntax:

git diff [source branch] [target branch]

preview changes before merging 

References: 

 Git log command examples https://www.thegeekstuff.com/2014/04/git-log/