PS1="\[\e[37;40m\][\[\e[32;40m\]\u\[\e[37;40m\]@\h \[\e[36;40m\]\w\[\e[0m\]]\\$ "

OR
vim ~/.bashrc
append 

source .bashrc


详细请见
https://www.cnblogs.com/Q--T/p/5394993.html
http://www.cnblogs.com/menlsh/archive/2012/08/27/2659101.html