Many every day actions in Ubuntu can be done easily from terminal using
dbus. The main advantage is it can be done exactly the GUI does, using a one liner, such as change brightness, copy file, etc.
For example, to decrease brightness standard terminal method is:
xbacklight +30% #-30%
While dbus method (I break line for better readability):
dbus-send --session --print-reply --dest="org.gnome.SettingsDaemon" \ /org/gnome/SettingsDaemon/Power \ org.gnome.SettingsDaemon.Power.Screen.SetPercentage uint32:30
To copy file
cp ./a/source ./b/destination
qdbus org.gnome.Nautilus /org/gnome/Nautilus \ org.gnome.Nautilus.FileOperations.CopyFile \ "file:///source/directory" "*" \ "file:///destination/directory" ""
qdbus graphical indicators are displayed with speed and canel button.
dbus is something interesting and I really want to learn D-Bus stuff. Please guide my by providing some e-books, links, etc.