#!/bin/bash
device=ubd
major=98
minor=0
for u in a b c d e f g h
        do dev=$device$u
        
        mknod $dev b $major $minor
        chmod 660 $dev
        chgrp disk $dev
        
        for i in $(seq 1 15)
                do 
                mknod $dev$i b $major $(($minor + $i)) 
                chmod 660 $dev$i
                chgrp disk $dev$i
        done
        minor=$(($minor + 16))
done