Here's the history of the commands I executed from someday in this year to today.
$ ruby -pe 'gsub(/^.+;| .+$/,"")' .zhistory | sort | uniq -c | sort -r | head -30
880 sudo
831 svk
473 ls
369 cd
217 rm
199 perl
195 svn
121 apt-cache
117 mv
106 wget
101 chmod
100 mkdir
84 perldoc
79 cp
76 cat
60 '
52
49 vi
44 href
34 tar
34 less
32 ps
30 echo
29 ruby
29 ln
27 locate
24 jed
23 kill
22 screen
22 lv