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history|awk '{a[$2]++ } END{for(i in a){print a[i] " " i}}'|sort -rn|h
+ead

history | perl -le 'while($l = <>) {$n=${[split(/\s+/,$l)]}[2];$h{$n}+
++;} $i=0;@a=reverse sort {$h{$a}<=>$h{$b}} keys %h; print "$h{$a[$_]}
+ $a[$_]" for (0..9)'