Setup dotfiles alias

alias dotfiles='/usr/bin/git --git-dir=$HOME/.cfg/ --work-tree=$HOME'

Fork repository, and clone

git clone --bare https://github.com/<github username>/dotfiles.git $HOME/.dotfiles

Backup old files that will conflict.

mkdir -p .config-backup && \
config checkout 2>&1 | egrep "\s+\." | awk {'print $1'} | \
xargs -I{} mv {} .config-backup/{}

Checkout dotfiles into $HOME

dotfiles checkout

Use diff to see what changes need to be migrated to your new files.

diff -urN .config-backup/.bashrc .bashrc > bashrc.patch

When adding or changing a dotfile in ${HOME}

dotfiles status
dotfiles add .vimrc
dotfiles commit -m "Updated .vimrc"
dotfiles push -u origin master

Now you are ready to version control your dotfiles, create branches for different envs, and do cool things.

Reference: https://developer.atlassian.com/blog/2016/02/best-way-to-store-dotfiles-git-bare-repo/