I was installing rvm
and for some reasons i changed first line on root's
what was there?
if [[ -n "$PS1" ]]; then and see that i'm root, can't undo... What string is first like if... in Ubuntu 12.04 for root?
I'm not awfully clear on what you've done & why, but I believe this is what you're asking for (NB: taken from 12.10 - it should be similar):