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1. List most frequently used commands

   $ history|awk '{a[$2]++ }END{for(i in a){print a[i]" "i}}'|sort -rn|head
   159 svn
   112 rm
   53 cd
   38 python2.5
   26 open
   12 ls
   9 python
   7 pdflatex
   6 whois
   6 locate