What I did after I installed Ubuntu 12.10

Define some safe commands: 

 Create file ~/bin/longliqwrc.sh

alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'

Add the following lines to ~/.bashrc

if [ -f ~/bin/longliqw.sh ]; then
    . ~/bin/longliqw.sh
fi

Add the following lines to ~/.profile

if [ -f "$HOME/.bashrc" ]; then
    . "$HOME/.bashrc"
fi