Rob dared me to fire up my favorite shell and jump into the game. Imagine my disappointment when I was greeted with this bummer of an error message.
Hmm. No dice. OK, on to my second choice.
jason@jmac:~> history | awk ‘{a[$2]++}END{for(i in a){print a[i] " " i}}’ | sort -rn | head
48 [...]