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Simply input the following command into Terminal:
history | sed ‘s/ / /g’ | cut -d” ” -f3 | sort | uniq -c | sort -n | tail | sort -nr
EDIT: Thanks to rmull from reddit, the code should be fixed now.
For me, the output is:
55 exit
51 update
44 apt-get
39 upgrade
31 cd
24 dir
22 nano
19 killall
12 umount
8 ntfsfix
Pretty dull, I suppose. 
Mostly apt-get, file operations and NTFS operations.
What did you get?
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