$ history|awk '{a[$2]++} END{for(i in a){printf "%5d\t%s \n",a[i],i}}'|sort -rn|head
215 cd
121 ls
97 vim
41 grep
4 find
3 vimdiff
3 touch
2 tail
2 perl
2 less
$ history|awk '{a[$2]++} END{for(i in a){printf "%5d\t%s \n",a[i],i}}'|sort -rn|head
215 cd
121 ls
97 vim
41 grep
4 find
3 vimdiff
3 touch
2 tail
2 perl
2 less
