Ubuntu allow hostnames - make sure that file owner and permissions are set correctly

crontab

5 * * * * bash -c "/etc/hostnames.sh"

hostnames.allow

# Used by script "hostnames.sh" which converts hosts.allow-styled entries with hostname to entries with equivalent ip-adresses
# Provide standard hosts.allow syntax with hostname
# Example:	ALL:domain.org

ALL:sub.example.com # Person X

hostnames.sh

#!/bin/bash
cd /etc

SEPARATOR_START="### SECTION START - generated hostnames entries ###\n# This is a generated section. Do NOT edit (including comments)!"
SEPARATOR_END="### SECTION END ###"

hostip_config_string="${SEPARATOR_START}\n"
while IFS='' read -r line || [[ -n "$line" ]]; do
        if [[ ! $line =~ ^\s*# && ! $line =~ ^\s*$ ]]; then
                host_type=`echo $line | sed 's/^\([^:]*\):.*$/\1/g'`
                hostname=`echo $line | sed 's/[^:]*:\([a-zA-Z_\.:~-]*\).*/\1/g'`
                last_part=`echo $line | sed 's/[^:]*:[a-zA-Z_\.:~-]*\(.*\)/\1/g'`
                hostname_ip=`getent hosts "$hostname" | awk '{ print $1 }'`
                if [ -n "$hostname_ip" ]; then
                        hostip_config_string+="${host_type}:${hostname_ip}${last_part}\n"
                fi
        fi
done < "hostnames.allow"
hostip_config_string+=$SEPARATOR_END

FILE="hosts.allow"
sed -i ':a;N;$!ba;s/'"$SEPARATOR_START"'.*'"$SEPARATOR_END"'/'"$hostip_config_string"'/g' $FILE
if ! grep -zoq "${SEPARATOR_START/\\n/.}.*${SEPARATOR_END}" $FILE; then
        printf "\n$hostip_config_string\n">>$FILE
fi

exit 0