Como posso parar de exibir eco em um script

Question

Eu tenho um script bash que gera outro script. Gostaria que a saída do eco fosse apenas para o arquivo, mas ele exibe na tela tudo o que eu tento (&> por exemplo). Aqui está o código:

while read line; do echo "sudo ufw deny from "$line" to any"; done < /home/photobcdev/hack-ban.txt  >>/home/photobcdev/hack-ban.tmp

Funciona bem, mas exibe centenas de linhas sempre que é executado. Como fazer isso ficar quieto? Aqui está o script completo para informações contextuais:

#!/bin/bash
DATE=$(date +%Y-%m-%d--%H-%M)
echo $(date)"   Suppression fichiers temporaires"
rm /home/photobcdev/hack.txt 2> /dev/null
rm /home/photobcdev/hack-ip.txt 2> /dev/null
rm /home/photobcdev/hack-ban.txt 2> /dev/null
rm /home/photobcdev/hack-ban.tmp 2> /dev/null
rm /home/photobcdev/hack-ban-diff.sh 2> /dev/null
echo $(date)"   Génération liste IPs"
sudo grep 'Disconnected from invalid user' /var/log/auth.log>>/home/photobcdev/hack.txt
grep -o -E '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' /home/photobcdev/hack.txt>>/home/photobcdev/hack-ip.txt
sort -u /home/photobcdev/hack-ip.txt>>/home/photobcdev/hack-ban.txt
wc -l /home/photobcdev/hack-ban.txt
echo $(date)"   Génération script ufw ban /IP"
#while read line; do echo "sudo ufw deny from "$line" to any"; done < /home/photobcdev/hack-ban.txt  >>/home/photobcdev/hack-ban.tmp
while read line; do
  echo "sudo ufw deny from $line to any" >> /home/photobcdev/hack-ban.tmp
  done < /home/photobcdev/hack-ban.txt
echo $(date)"   Création fichier final"
sort -u /home/photobcdev/hack-ban.tmp>>/home/photobcdev/hack-ban-${DATE}.sh
sort -u /home/photobcdev/hack-ban.sh
wc -l /home/photobcdev/hack-ban-${DATE}.sh
chmod +x /home/photobcdev/hack-ban-${DATE}.sh
grep -v -f /home/photobcdev/hack-ban.sh /home/photobcdev/hack-ban-${DATE}.sh >>/home/photobcdev/hack-ban-diff.sh
if [ -s /home/photobcdev/hack-ban-diff.sh ]; then
        # Fichier non vide
        echo $(date)"  Fichier hack-ban-diff.sh généré"
        wc -l /home/photobcdev/hack-ban-diff.sh
        rm -f /home/photobcdev/hack-ban.sh  2> /dev/null
        mv /home/photobcdev/hack-ban-${DATE}.sh /home/photobcdev/hack-ban.sh
        chmod +x /home/photobcdev/hack-ban-diff.sh
        echo $(date)"   Exécution hack-ban-diff.sh"
        /home/photobcdev/hack-ban-diff.sh
else
        # Fichier vide
        rm -f /home/photobcdev/hack-ban-diff.sh  2> /dev/null
        rm -f /home/photobcdev/hack-ban-${DATE}.sh  2> /dev/null
        echo $(date)"  Pas de nouvelles IP détectées"
fi