1安装bash-completion
curl https://raw.githubusercontent.com/git/git/master/contrib/completion/git-completion.bash -o ~/.git-completion.bash
2添加到 .bash_profile
vim ~/.bash_profile
3添加内容
if [ -f ~/.git-completion.bash ]; then
. ~/.git-completion.bash
fi
4保存后刷新
source ~/.bash_profile