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$ sudo apt install git

$ sudo apt install git-extras

$ git config --global user.email "email"
$ git config --global user.name  "full name"

$ git config --global push.default simple

$ git clone git@github.com:username/repository.git

$ git checkout -b branch-name

$ git branch
$ git status

$ git status

$ git add --all

$ git add file-path

$ git commit -m "commit-message"

$ git push origin branch-name

$ git fetch --all

$ git branch -d branch-name

$ git push origin --delete branch-name

$ git branch -d branch-name

$ git push origin --delete branch-name

$ git fetch --all --prune

$ git clone --depth 1 repository URL

$ git push
Username for 'https://github.com':

$ git remote -v
origin  https://github.com/duckietown/Software.git (fetch)
origin  https://github.com/duckietown/Software.git (push)

$ git remote -v
origin  git@github.com:duckietown/Software.git (fetch)
origin  git@github.com:duckietown/Software.git (push)

$ git remote remove origin
$ git remote add origin git@github.com:duckietown/Software.git

fatal: The current branch branch name has no upstream branch.

$ git push --set-upstream origin branch name