How to emit dbus signal from command line

Is there a way to emit dbus signal from co开发者_StackOverflowmmand line using dbus-send or something else ?

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You can use the utility dbus-send to send D-Bus request from the command line.

dbus-send --system --type=signal / com.example.signal_name

or if you'd like to send some data with the signal

dbus-send --system --type=signal / com.example.signal_name string:"hello"

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You could also use qdbus. There is a decent tutorial here.