Shorewall users - Feb 2014 - Iptables interpret code in Shorewall - For Loop (Iptables)

How could interpret this code in shorewall?

---------
Code in Iptables:

for URL in `grep -v "^#" /etc/squid/liberados_443`; do
#
iptables -I FORWARD -p tcp --dport 443 -d $URL -j ACCEPT
done

-------


I need to be able to output only to Internet Web sites I want to give
access.

Thank you.


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