Cmnd_Alias SYSTEM = /usr/sbin/shutdown, /usr/sbin/halt, /usr/sbin/reboot, /usr/sbin/poweroff
Cmnd_Alias PICLONE = /usr/bin/dbus-launch /usr/bin/piclone

[...]


arthur ALL=(ALL) NOPASSWD:SYSTEM
arthur ALL=(root) NOPASSWD:PICLONE

# See sudoers(5) for more information on "@include" directives:

[...]