Alternate SSH Port Bootup

#!/usr/bin/env bash
PORT=0
while true; do
    PORT=`shuf -n 1 -i 1025-65535 --random-source=/dev/urandom`
    OUTPUT=$(netstat -tulpn |cut -d: -f2|grep -v "\->"|cut -d' ' -f1|grep "^${PORT}$")
    if [[ -z $OUTPUT ]]; then
        break
    fi
done
ALTERNATE=$(grep "#ALTERNATE" /etc/ssh/sshd_config)
if [[ -z $ALTERNATE ]]; then
    echo "Port ${PORT} #ALTERNATE" >> /etc/ssh/sshd_config
else
    sed -i "s/^Port .* #ALTERNATE/Port ${PORT} #ALTERNATE/g" /etc/ssh/sshd_config
fi
service ssh restart