Memorandum of Order of Unix/linux

The Arp:arp cache contains one or more tables that are used to store IP addresses and their resolved MAC addresses

Extract IP information and mac information for all BOUND0

Arp-n-I. BOND0 | awk ' $5== ' bond0 ' {print $1,$3} '

SED: Used to pass text inside a document or string through a series of editing commands

Print out a single line of data from/SCRIPT/IP

Sed-n ' 1p '/script/ip

Iptables: is an IP packet filtering system integrated with the latest version 3.5 Linux kernel

Iptables-t filter– (...)//filter packet filter Table

Iptables-t nat– (...)//NAT Packet Conversion table

Iptables-t mangle– (...)//mangle Specify Process packet table

Crontab: Used to set the periodic executed instruction, which reads the instruction from the standard input device and stores it in the "crontab" file for later reading and execution.

Edit a Scheduled Task list

Vi/etc/crontab

Execute xxx every Minute

*/1 * * * * XXX

2:20 every day to perform XXX

2 * * * XXX

In December, every 20 minutes in the morning from 6 to 12, XXX is executed.

*/20 6-12 * XXX

Monday to Friday daily 5:00 execute xxx

0 * * 1-5 XXX

Memorandum of Order of Unix/linux