There was a Meme going on at Planet Fedora.

I’m going to join:

    bdeferme@sight:~$ history | awk '{a[$2]++ } END{for(i in a){print a[i] " " i}}'|sort -rn|head
    83 ls
    80 ssh
    74 sudo
    60 cd
    22 scp
    19 vim
    14 sh
    9 vi
    9 date
    8 tar
    
    bdeferme @ sense:~$ history | awk '{a[$2]++ } END{for(i in a){print a[i] " " i}}'|sort -rn|head
    296 ls
    172 cd
    63 mv
    56 screen
    47 ssh
    38 su
    33 rm
    32 wget
    23 cat
    21 scp
    

Edit: forgot a system :-o

    bdeferme @ serenity:~$ history | awk '{a[$2]++ } END{for(i in a){print a[i] " " i}}'|sort -rn|head
    72 vi
    59 ls
    50 screen
    47 su
    39 clear
    35 cat
    28 fetchmail
    15 ping
    13 cd
    10 ssh