提示符具體含義可參考： http://billie66.github.io/TLCL/book/zh/chap14.html

Ubuntu16.04個人配置如下，供以後查閱

 1 function git_branch {
 2    branch="`git branch 2>/dev/null | grep "^\*" | sed -e "s/^\*\ //"`"
 3    if [ "${branch}" != "" ];then
 4       if [ "${branch}" = "(no branch)" ];then
 5          branch="(`git rev-parse --short HEAD`...)"
 6
 
       fi
 7       echo " ($branch)"
 8    fi
 9 }
10 export PS1=‘\[\033[4;45m\]\u\[\033[00m\]@\h \[\033[01;36m\]\W\[\033[01;32m\]$(git_branch)\[\033[00m\]\$ ‘

shell 提示符個性化設置