Joe made me do it.

[jrwren@utonium:$] history 1000 | awk ‘{a[$2]++}END{for(i in a){print a[i] ” ” i}}’ | sort -rn | head
77 ls
38 growisofs
38 df
35 sudo
29 man
23 mv
20 x=2;y=2;while
19 cat
17 rm
16 zip