wow...that's quite some statistical data you gathered! I tried this myself using this command:

    cat ~/.bash_history | cut -f1 -d' ' | sort | uniq -c | sort -n -r

turns out my .bash_history is clipped at it's default size-limit (500 lines). So I'll change that to gather more data for next year. My results started with: 147 clang++ 77 ls 54 cd 15 gs 14 rake 13 vim ...

where gs is short for "git status" ...and thanks for the hint about the substitution! I updated it on my page.