FIREWALL (IP tables ) Commands

Firewall commands, specifically iptables commands, are used to configure and manage the firewall rules in a Linux system. iptables is a powerful firewall utility that allows you to filter and manipulate network traffic based on various criteria. Here are some commonly used iptables commands:

`iptables -t filter -L`(is used to list the current firewall rules in the “filter” table of the “iptables” utility.)

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The command “iptables -t filter -L” is used to list the current firewall rules in the “filter” table of the “iptables” utility. “iptables” is a command-line tool used for managing
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`init 0`(is used to initiate a system shutdown in Linux.)
`uname -r`(” is used to display the kernel release information in Linux.)
`apt-get install package_name`
`cat file1 | command (sed, grep, awk, grep, etc …)> result.txt`
cat file1 file2 .. | command > file1_out.txt
`badblocks -v /dev/hda1`(is used to scan for bad blocks on the device or partition “/dev/hda1” in Linux systems.)
`mkfs /dev/hda1`(is used to create a file system on the device or partition)
`mkswap /dev/hda3`
`dump -0aj -f /tmp/home0.bak home` (is used to create a backup of the “home” directory using the “dump” utility.)
`cdrecord -v gracetime = 2 dev = /dev/cdrom -eject blank = fast -force`
`ifconfig eth0`(command is used to display the configuration information of the network interface named eth0)
`iptables -t filter -L`(is used to list the current firewall rules in the “filter” table of the “iptables” utility.)