修改PS1，当进入git目录下，自动显示branch name

方法1.

function git_branch {

branch="`git branch 2>/dev/null | grep "^\*" | sed -e "s/^\*\ //"`"

if [ "${branch}" != "" ];then

if [ $branch == *"HEAD"* ];then

branch="`git rev-parse --short HEAD`"

fi

echo "($branch)"

fi

}

export PS1='\[\e]0;\u@\h: \w\a\]{debian_chroot:+(debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[01;32m\](git_branch)\\\[\\033\[00m\\\]\\'

方法2.

PS1='\u@\h:\w(__git_ps1 " (%s)")\\ '