補完

https://packages.debian.org/ja/wheezy/bash-completion

# apt-get install bash-completion

http://stackoverflow.com/questions/11173447/git-bash-completion-on-debian

$ cat ~/.bashrc
(中略) 
if [ -f /etc/bash_completion ]; then
    . /etc/bash_completion
fi

実体としては/etc/bash_completion.d/git