Hi, I just put an application into hackage http://hackage.haskell.org/package/traypoweroff. I made this application to allow a tray icon in xmonad to poweroff and reboot my computer. But I dislike two things I made. The first one is the use of */sbin/poweroff* and */sbin/reboot* with system call. I feel than i should be a better way to do the poweroff or the reboot. err <- system "sudo /sbin/reboot" The second issue is, the user need to put into sudoers the permission to execute reboot and poweroff. The use of *sudo* seems a little awkward. I'll like a cleaner installation without force user touch configuration files. myuser ALL=(ALL) NOPASSWD: /sbin/poweroff Thanks for the help, Luis Cabellos p.d: I'll add suspend with pm-suspend command in the next version BTW