$ ps aux | grep xf
david    24330  0.0  0.0   1660   484 ?        Ss   22:59   0:00 /bin/sh /etc/xdg/xfce4/xinitrc
david    24401  0.0  0.0   4492   704 ?        Ss   22:59   0:00 /usr/bin/ssh-agent /usr/bin/ssh-agent /usr/bin/dbus-launch --exit-with-session startxfce4
david    24402  0.0  0.0   4492   708 ?        Ss   22:59   0:00 /usr/bin/ssh-agent /usr/bin/dbus-launch --exit-with-session startxfce4
david    24405  0.0  0.0   2648   652 ?        S    22:59   0:00 /usr/bin/dbus-launch --exit-with-session startxfce4
david    24415  0.0  0.4  13008  4744 ?        S    22:59   0:00 /usr/bin/xfce4-session
david    24424  0.0  0.5  17184  5332 ?        Ss   22:59   0:00 xfce-mcs-manager
david    24426  0.0  0.6  13844  6820 ?        S    22:59   0:00 xfwm4
david    24926  0.0  0.0   3712   620 pts/0    S+   23:10   0:00 grep xf