Do sudo gedit /etc/init.d/gdm then look at the bottom of the gedit window where you see sh, Tab Width, Ln. That's what you're looking for "Ln" which means line number.
Do sudo gedit /etc/init.d/gdm then look at the bottom of the gedit window where you see sh, Tab Width, Ln. That's what you're looking for "Ln" which means line number.