What I did after I installed Ubuntu 12.10

Define some safe commands: 

 Create file ~/bin/

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

Add the following lines to ~/.bashrc

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

Add the following lines to ~/.profile

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