Removing Duplicate Iptables Rules

Snippet for removing duplicate entries from iptables

iptables-save > /tmp/iptables_backup.conf  
iptables-save | awk '!x[$0]++' > /tmp/iptables.conf  
iptables -F  
iptables-restore < /tmp/iptables.conf  
service iptables save  
service iptables restart