understanding user password authentication in Linux The user authentication process in Linux typically involves validating the entered credentials against the stored user information in the /etc/passwd and /etc/shadow files. When a user attempts to log in, they provide a username…
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…
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…
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: In this article, we will dive…
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…
This article is part of the following series. In Linux, file permissions play a crucial role in determining who can access, modify, or execute files and directories. The permissions are typically represented by a combination of read (r), write…
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…
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…
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…
