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='\\\e0;\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)")\\ '