CentOS and iptables

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Gentlemen, I decided then to get acquainted with centos, actually need to configure iptables, it's all just principle, and on other systems does not cause problems, but then came to a screeching halt. opened documentation
wiki.centos.org/HowTos/Network/IPTables
in fact all is clear, create the script, write the rule from the example, the result is:
./firewall.sh: line 7: iptables: command not found
and so all commands that are not so can not understand

centos 5.5 final
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6 Answers

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which iptables what gives?
And check whether the path in the PATH variable.
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Correct the scripts to do:
IPT=/sbin/iptables (or other)
\r
$IPT (the rule)
$IPT (the rule)
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The most simple — whereis iptables
and then in the script add the first
IPTABLES=/sbin/iptables (or more General option —
IPTABLES=`whereis -b iptables | cut-d" " -f2`
) and then use in design
$IPTABLES -A <...>
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sudo?
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Root script launch?
\r
If you don't. Start from the root.
Full path to iptables: /sbin/iptables
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sudo chmod 755 firewall.sh
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