If you want the commands ls, ll or l to be colorized you have to edit the file ~/.bashrc as follows.
Open the file ~/.bashrc in any editor
[Translate to Englisch:] nano ~/.bashrc # oder vi ~/.bashrc
Adjust the file ~/.bashrc
# You may uncomment the following lines if you want `ls' to be colorized: export LS_OPTIONS='--color=auto' eval "`dircolors`" alias ls='ls $LS_OPTIONS' alias ll='ls $LS_OPTIONS -l' alias l='ls $LS_OPTIONS -lA'