What's in your bash history?
As Tim says, you can tell a lot about a man from his bash history.
doe% history | awk {'print $2'} | sort | uniq -c | sort -k1 -rn | head
327 svn
147 cd
86 ls
61 rake
38 cap
37 sudo
35 gem
23 cat
21 find
18 update-puppet
What's in yours?