$ sudo ck-history --frequent root 5732 jamie 5336 gdm 465 revssh 30 rdnssd 21 (null) 9
(revssh is uid 998).
$ sudo ck-history --frequent
root 5732
jamie 5336
gdm 465
revssh 30
rdnssd 21
(null) 9
(revssh is uid 998).