CIDR stands for Classless Inter-Domain Routing. It is a method used for allocating and routing IP addresses on the Internet. A /24 CIDR, such as 192.168.1.0/24, indicates that the first 24 bits are the network part of the address, leaving the remaining 8 bits for host addresses. Traditionally, IP addresses were divided into different classes, …

Linux is designed to be a multi-user operating system, allowing multiple users to access and utilize the system concurrently. To effectively list the users on a Linux system, two powerful methods come into play: using the “cat /etc/passwd” command and using the the “getent” command. In this article, we’ll explore these methods that allow you …

The error message “mv: cannot access ”: Permission denied” indicates that you are trying to move or rename a directory without the access permissions. There are a few reasons why this error happens: Insufficient permissions: The directory you are attempting to move or rename is owned by another user, and you do not have the …

Copy directory in Linux The error message “cp: -r not specified; omitting directory” is encountered when using the cp command in Linux without specifying the -r option for copying directories. The cp command is primarily used to copy files and directories from one location to another. However, by default, cp does not copy directories unless …

This article is part of the following series. A Beginner’s Guide to Linux File Permissions 2 ways to check file permissions in Linux 2 ways to change file permissions in Linux   In Linux, file permissions play a crucial role in determining who can access, modify, or execute files and directories. The permissions are typically …

The error message “ssh: connect to host <host> port 22: Connection refused” typically indicates that your SSH client is unable to establish a connection with the SSH server. It can occur due to various reasons. The SSH server may not be running on the remote host, the host or IP address provided could be incorrect, …

A multipath disk, also known as a “multipath device,” is a logical representation of a storage device in a storage area network (SAN) environment that utilizes multiple physical paths. In a multipath configuration, a storage device, such as a disk array or a storage area network (SAN) volume, can be accessed through multiple physical paths. …

In AWS EC2 (Elastic Compute Cloud), user data refers to the information or scripts that you can provide to an EC2 instance during its launch. User data can be used to automate instance configuration and perform various tasks on the instance. When launching an EC2 instance, you can specify user data in the form of …

Understanding the directory structure and how to navigate the Linux file system are essential skills for people interested in system administration, development, and anyone working or aspiring to work with Linux-based systems. This tutorial aims to provide a detailed explanation of the Linux file system, its directory structure, and some basic commands necessary to explore …