I figure I’d join the band-wagon too, but I’ll use *readable* $() vs the absolutely unreadable-horrible-habit `. (Yes, that is a `. What? You can’t tell what character that is? Yeah, neither can I when you use it in your code! Its a back-tick and shouldn’t be used because its unreadable!)
christer@007:~$ history | awk $({a[$2]++ } END{for(i in a){print a[i] " " i}})|sort -rn|head
96 ls
87 vim
70 cd
60 bzr
25 sudo
16 rm
14 ssh
13 grep
13 cat
11 scp
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