windows console prompt modification

by setting prompt to be $d $t @ $p$_$g$S in environment variables.

reference

Change your DOS/Command prompt
http://www.chami.com/tips/windows/020497W.html

cmd - How do I change the command-line prompt in Windows? - Stack Overflow
https://stackoverflow.com/questions/12028372/how-do-i-change-the-command-line-prompt-in-windows