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# Default runlevel. (Do not set to 0 or 6)
id:5:initdefault:
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iptables - [RI] chain rule num rule-specification[option]
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iptables -D chain rule num[option]
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iptables -[LFZ] [chain][option]
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iptables -[NX] chain
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pid_t pid=fork()
it has 3 situation for the return result pid
0 child
>0 parent process
<0 fork fail
fork create a new process and it parent live alse when the child process had been created ......
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