linux query command collection

/sbin/iptables -I INPUT -p tcp --dport 8000 -j ACCEPT #Open port 8000 

/etc/rc.d/init.d/iptables save #Save configuration 

/etc/rc.d/init.d/iptables restart #Restart the service 

Check if the port is open 

/etc/init.d/iptables status

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