anders@Ubuntu:~$ ps aux | grep trans
anders    4504  0.2  0.5 745056 22276 ?        Sl   14:28   0:00 transmission-gtk
anders    4635  0.0  0.0  13576   924 pts/0    S+   14:32   0:00 grep --color=auto trans
anders@Ubuntu:~$ killall transmission
transmission: no process found
anders@Ubuntu:~$ killall transmission-gtk
transmission-gtk: no process found