#!/bin/bash
DBFILENAME='/usr/share/opera-adblock-complete/urlfilter.ini'
TMPFILENAME='/tmp/opera-adblock-urlfilter.ini'

modifyfilters(){
    chown 777 $DBFILENAME
    echo "#UsersOwnFiltersHere" > $DBFILENAME
    if [ -f "$TMPFILENAME" ]; then
        cat $TMPFILENAME >> $DBFILENAME
    fi
}
while true; do
    read -p "Do you want to keep your own changes to urlfilers and give everyone rights to modify them? [Y/n] "
    case $yn in
        [Yy]* ) modifyfilters; break;;
        [Nn]* ) exit;;
        * ) echo "Please answer yes or no.";;
    esac
done