You mean when you ls and dir's come up blue, executables come up green, images come up purple, etc...? That is done by putting is ls --color and that will make 'em show up. If you dont wanna do that everytime, you can put the line alias ls='ls --color' in your ~/.bashrc and ~/.bash_profile - you could probably edit /etc/bashrc and /etc/bash_profile to include it as well, that way all users (current and future) will have the same affect. Its also good to put little things like alias rm='rm -i' (and cp, mv and the like) the -i meaning interactive, so it asks you if youre sure, before you make a silly mistake. You can always override it with the -f option.