I was installing rvm
and for some reasons i changed first line on root's
what was there?
if [[ -n "$PS1" ]]; then and see that i'm root, can't undo... What string is first like if... in Ubuntu 12.04 for root?
I'm not awfully clear on what you've done & why, but I believe this is what you're asking for (NB: taken from 12.10 - it should be similar):
ace@ace2:~/src$ sudo head -n 20 /root/.bashrc # ~/.bashrc: executed by bash(1) for non-login shells. # see /usr/share/doc/bash/examples/startup-files (in the package bash-doc) # for examples # If not running interactively, don't do anything [ -z "$PS1" ] && return # don't put duplicate lines in the history. See bash(1) for more options # ... or force ignoredups and ignorespace HISTCONTROL=ignoredups:ignorespace # append to the history file, don't overwrite it shopt -s histappend # for setting history length see HISTSIZE and HISTFILESIZE in bash(1) HISTSIZE=1000 HISTFILESIZE=2000 # check the window size after each command and, if necessary, # update the values of LINES and COLUMNS.