See each individual file.

• Back up old files

    cd ~
    mv .emacs.d .emacs.d-bak
    mv .emacs .emacs-bak
  

• Clone the repository

    cd ~
    git clone https://github.com/feng-li/.emacs.d.git
    cd ~/.emacs.d/
    git submodule update --init --recursive
  

• Synchronize with the remote

    cd ~/.emacs.d/
    git pull
    git submodule sync
    git submodule foreach git checkout master
    git submodule foreach git pull
  

• For submodules, please report bugs to the corresponding authors.
• For other issues, please visit https://github.com/feng-li/.emacs.d/issues .