Cairnarvon started it.

lolife [10:15pm] % history | awk '{print $3}' | sort | uniq -c | sort -rn | head
73 ls
53 svn
38 cd
35 ssh
28 lepton
21 sudo
19 vi
17 ping
13 exit
12 pwd

I use tcsh so my command is a bit different than his.