for your .bashrc

gistfile1.txt

# run nethogs on the interface that is being used for the default route
function nethogs {

        dev=`ip r | grep '^default' | awk '{print $5}'`
        #echo $dev
        if [ `id -u` -eq 0 ]; then
                nethogs $@ $dev
        else
                sudo nethogs $@ $dev
        fi
        return $?
}