Problem in launching a terminal command with a Qt Button

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http://www.linuxquestions.org – hello everybody, I've created a QT interface with some buttons and labels, and i want to launch a terminal command with one of these buttons,but the command maust starts with "sudo",unfortunately it didn't work because it wants root password and i can't enter it even in the Button cammand.... plz help mz thnx (HowTos)