I just downloaded BackTrack 2.0 final Live CD and it seems to run OK but I know nothing about Linux and can't get programs to run from the command prompt. For example this what I get when I try to run airodump:

bt ~# airodump
bash: airodump: command not found

I've searched the forum for hours but am more confused than before. The How-to for the live cd says that after the cd boots up and you log on to reboot but when I do that it just does the same thing again, but if I just type startx it seems to work OK.