Linux common commands

gistfile1.txt

iptables:
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/etc/init.d/iptables save

This will save all rules in /etc/sysconfig/iptables, then just enable the iptables service at start-up using:

/sbin/iptables-save  > /etc/iptables.rules

/sbin/iptables-restore < /etc/iptables.rule

hostname:
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/etc/sysconfig/network file.
/etc/hosts file.