Change libusb device mode to 0666 in udev rule file

#! /bin/bash

OS=`lsb_release -i`
OS=${OS#Dis*ID:}

if [ $OS == "Ubuntu" ]
then
        if [ ! -f "/etc/udev/rules.d/50-udev-default.rules" ]
        then
                echo "copy 50-udev-default.rules"
                cp -f /lib/udev/rules.d/50-udev-default.rules /etc/udev/rules.d/
        else
                cp -f /etc/udev/rules.d/50-udev-default.rules .
        fi
        echo "change libusb MODE=666"
        sudo sed -i -e "s/SUBSYSTEM==\"usb\", ENV{DEVTYPE}==\"usb_device\", MODE=\"[0-9]*\"/SUBSYSTEM==\"usb\", ENV{DEVTYPE}==\"usb_device\", MODE=\"0666\"/g" /etc/udev/rules.d/50-udev-default.rules
        echo "restart udev"
        service udev restart
elif [ $OS == "CentOS" ]
then
        cp -f /etc/udev/rules.d/50-udev.rules .
        echo "append libusb MODE=666"
        sed -i -e ':begin; /ACTION=="add", SUBSYSTEM=="usb_device"/,/MODE="[0-9]*"/ { /MODE="[0-9]*"/! { $! { N; b begin }; }; s/MODE="[0-9]*"/MODE=\"0666\"/; }' /etc/udev/rules.d/50-udev.rules
        echo "restart isdn"
        /etc/init.d/isdn restart
fi

chmod 666 -R /dev/bus/usb/*/*