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I need to write some linux specific system daemon(it will run with root privileges).
I have stereotype, that Qt is all about GUI applications, so daemon that depends on Qt looks strange to me.
On the other side, Qt has nice C++ bindings for DBUS/threads/settings/… – everything i need for my daemon.
Now I am interested, is it okay to write non GUI system tools/daemons with Qt? Are there examples of such tools?
Yes, this is perfectly fine.
There is the QCoreApplication class for non UI applications.
Specific to daemons, you might want to check out Daemonizing a Qt-application.