一招告诉你怎样牛逼的显示终端，命令提示符

cat /etc/profile   ======> . /etc/profile #使之生效
D=$'\e[37;40m'
PINK=$'\e[35;40m'
GREEN=$'\e[32;40m'
ORANGE=$'\e[33;40m'

hg_ps1() {
    hg prompt "{${D} on ${PINK}{branch}}{${D} at ${ORANGE}{bookmark}}{${GREEN}{status}}" 2> /dev/null
}

export PS1='\n${PINK}\u ${D}at ${ORANGE}\h ${D}in ${GREEN}\w`hg_ps1`\
${D}\n\$ '