DOS - BASH

Many Ubuntu users confused with  ubuntu terminal commands.For those friends.....
           DIR - ls -l
           EDIT - vi or pico
           COPY - cp

Some gui application equalent to dos
          cmd - gnome-terminal or konsol(kubuntu)
          taskmgr - gnome-system-monitor
          notepad - gedit
          mspaint - tuxpaint
If you want more look on bash commands here is a small doc