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Creating a simple NAT and DMZ firewall using bash script

In this article, we will create a simple NAT firewall with DMZ using iptables.PrerequisitesBesides having a Terminal open, you need to ensure that iptables is installed in your machine.Write scriptWe will write a script to set up a DMZ using iptables. Create...

Making a simple IRC chat bot logger using bash script

In this article, we will make a simple bot logger. This script will log a few channels as well as handle the pings.PrerequisitesBesides having a Terminal open, you need to have basic knowledge of IRC.Write script:Now, we will write a script for an IRC logging bot....

Creating a lame utility HTTP server in Linux Operating System

In this article, we will discuss the cURL tool in Linux. The cURL tool is used for transferring the data from or to a server. It supports many protocols, and http is one of them. cURL is used to transfer the data from URL. It has so many tricks to offer, such as http...




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How to executing your script on startup

This script is not limited to running only applications or services at startup, but to also start scripts on bootup (power on) of a system. For example, if your system boots up and you would like to apply several tweaks to the OS such as performance enhancements or...

Write a bash script for generating and trapping signals for cleanup

You have probably pressed Ctrl + C or Ctrl + Z without knowing what was occurring—it's just like pressing Ctrl + Alt + Delete in another OS, right? Well, in one regard, yes—it is a signal, but the action itself is very different in Linux. A signal at the hardware...

Invoking commands when they require permissions

Running as root is dangerous, although sometimes convenient—especially when you are new to Linux and password prompts seem to be a hassle. So far, as a Linux user, you may have seen the sudo command or the su command. These commands can allow a user to change users on...

Write a bash script to keep programs/scripts running after logoff

Leading up to getting our scripts to run as daemons, we need to know how to keep commands running after a user logs off (or better yet, have them started by the system itself (we will look at this in more detail later). When a user logs in, a session for that user is...

Understanding the /etc/passwd and /etc/shadow files

Now that we know how to create (and delete) user accounts on our server, we are well on our way to being able to manage our users. But where exactly is this information stored? We know that users store their personal files in /home, but is there some kind of database...

Creating and removing users in Ubuntu Linux

Creating users in Ubuntu can be done with one of two commands: adduser and useradd. This can be a little confusing at first, because both of these commands do the same thing (in different ways) and are named very similarly. I'll go over the useradd command first and...

Understanding users and groups in Linux

When it comes to a server, users are essential—without users to serve, then there's no real need for a server in the first place. The subject of user management itself within the world of IT is in and of itself quite vast. Entire books have been written on particular...

Setting up public key authentication in Linux

In this tutorial, I will show how to set up secure public key authentication.Getting ready You might need root privileges for certain tasks.How to do it... Follow these steps to set up public key authentication:Add a new user. You can skip this step if you have...

Linux Operating System: Setting resource limits with limits.conf

Ubuntu is known as a multi-tasking, multi-process, and multiuser operating system. If the system's all resources are used by any single process or user, other users and processes might not work in the system. In this tutorial, I'll show you how to set the resource...

Configuring root privileges for users with sudo

The Ubuntu Desktop or Server is installed with default root user; even on a cloud, you will get preinstalled Ubuntu server with an inbuilt root user. This account has full administrative access to perform administrative tasks. But sometimes, you need a different user...

Managing file permissions in Linux Operating System

We have created users and groups. In this recipe, you will work with default file permissions for users and groups, as well as see how to modify those permissions.Getting ready Create two users, user1 and user2. Create new group editor and add user1 and user2 as...

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