nate:~ bigfleet$ history 1000 | awk '{a[$2]++}END{for(i in a){print a[i] " " i}}' | sort -rn | head
              106 ls
              90 cd
              34 rake
              27 git
              25 autotest
              19 cap
              18 rm
              18 ps
              17 ssh
              15 sudo
              

              work:~ bigfleet$ history 1000 | awk '{a[$2]++}END{for(i in a){print a[i] " " i}}' | sort -rn | head
              74 cd
              66 ls
              53 ssh
              40 svn
              33 cap
              25 rake
              19 rm
              17 git
              15 autotest
              12 scp

Judge as you will