Knowledge Base
427 articles and guides on knowledge base from the NexonHost team — page 11 of 18.
What is loop and how to understand it.
What Is Loop And How To Understand It. Looping Statements in Shell Scripting: Three keywords to loop in Unix/Linux shell: 1.until The statements in the until loop are executed until the command in the condition becomes true. Syntax The following is the syntax of the until loop: until command do…
Read article →How to Create Directories with mkdir command.
How To Create Directories With Mkdir Command. This tutorial explain how to use the mkdir command. mkdir Command Syntax: The syntax for the mkdir command is as follows: mkdir [OPTION] [DIRECTORY] The command takes one or more directory names as its arguments. How to Create a New Directory To create…
Read article →How to Add and Delete Users on Ubuntu 18.04
How To Add And Delete Users On Ubuntu 18.04 In this tutorial, we will show you how to add and remove users with useradd / adduser and deluser/userdel on Ubuntu 18.04. To be able to create and remove users, you need to be logged in as root or user with sudo privileges . How…
Read article →How To Set or Change Timezone on CentOS 7.
How To Set Or Change Timezone On CentOS 7. This tutorial explains how to set or change the timezone on CentOS 7. To be able change the system’s timezone you’ll need to be logged in as root or user with sudo privileges . Checking the Current Timezone In CentOS and other modern Linux distros,…
Read article →How troubleshoot linux problems(server crash, out of memory). Diagnosing and Fixing Common Issues.
How Troubleshoot Linux Problems (Server Crash, Out Of Memory). Diagnosing And Fixing Common Issues. When your Linux server seems to be offline or otherwise inaccessible, you should always be able to log in with the web console or through a VNC connection. Steps you need to do for troubleshooting:…
Read article →How to use df command.
How To Use Df Command. In this article we will show you how to check disk space with df command. Using the df Command The general syntax for the df command is as follows: df [OPTIONS]… FILESYSTEM… When used without any argument, the df command will display information about all mounted file…
Read article →How to use watch command.
How To Use Watch Command. In this tutorial, we will introduce you to the watch command. watch is used to run any arbitrary command at regular intervals and displays the output of the command on the terminal window. The watch utility is a part of the procps (or procps-ng) package which is…
Read article →How to use Ping command.
How To Use Ping Command. In this article, wee will explain how to use ping command. ping is part of the iputils (or iputils-ping) package, which is pre-installed on nearly all Linux distributions. It is also available on Windows, macOS, and FreeBSD. How to Use the Ping Command The syntax for the…
Read article →How to Add and Delete Users on CentOS 7.
How To Add And Delete Users On CentOS 7. In this tutorial, we will explain how to add and remove users on CentOS 7 systems. How To Add User in CentOS In CentOS, you can create a new user account using the useradd command-line utility. To create a new user account named “username” you…
Read article →How To Secure Nginx with Let’s Encrypt on CentOS 7.
How To Secure Nginx With Let’s Encrypt On CentOS 7. Let’s Encrypt is a new Certificate Authority (CA) that provides a way to obtain and install free TLS/SSL certificates, thereby enabling encrypted HTTPS on web servers. It streamlines the process by providing a software client, Certbot, that…
Read article →How to use ls command.
How To Use Ls Command. This article will show you how to use the ls command through practical examples and detailed explanations of the most common ls options. ls is one of the basic commands that any Linux user should know. The ls command lists files and directories within the file system, and…
Read article →Bash Case Statement
Bash Case Statement In this tutorial, we will cover the basics of the Bash case statement and show you how to use it in your shell scripts. The bash case statement is generally used to simplify complex conditionals when you have multiple different choices. Using the case statement instead of…
Read article →Bash until Loop
Bash Until Loop This tutorial explains the basics of the until loop in Bash. Loops are one of the fundamental concepts of programming languages. Loops are handy when you want to run a series of commands over and over again until a specific condition is met. In scripting languages such as Bash,…
Read article →How to Enable and Disable Root User Account in Ubuntu
How To Enable And Disable Root User Account In Ubuntu This tutorial explains how to enable and disable the root user account in Ubuntu Linux. As a new Ubuntu user, you may wonder how to log in to your Ubuntu system as a root user or what is the default root password. In Ubuntu Linux,…
Read article →How to Add and Delete Users on Debian 9.
How To Add And Delete Users On Debian 9. This tutorial explains how to add and remove users on Debian 9. Debian, as well as all other Linux distributions, is a multi-user operating system. Each user can have different permission levels and specific settings for various command-line and GUI…
Read article →How To Set or Change Timezone on Debian 9.
How To Set Or Change Timezone On Debian 9. Using the correct timezone is important for many systems related tasks and processes. For example, the cron daemon uses the system’s timezone for executing cron jobs and the timestamps in the log files are based on the same system’s timezone. The system’s…
Read article →How to Check if a File or Directory Exists in Bash.
How To Check If A File Or Directory Exists In Bash. Many times when writing Shell scripts, you may find yourself in a situation where you need to perform an action based on whether a file exists or not. In Bash, you can use the test command to check whether a file exists and determine…
Read article →How to install RPM on ubuntu.
How To Install RPM On Ubuntu. The Ubuntu repositories contain thousands of deb packages which can be installed from the Ubuntu Software Center or by using the apt command-line utility. Deb is the installation package format used by all Debian based distributions, including Ubuntu. Some packages…
Read article →How to Delete/Remove Users.
How To Delete/Remove Users. This tutorial covers the userdel command and its options. Linux is a multi-user system, which means that more than one person can interact with the same system at the same time. As a system administrator, you have the responsibility to manage the system’s users and…
Read article →Bash Concatenate Strings
Bash Concatenate Strings In this tutorial, we will explain how to concatenate strings in Bash. One of the most commonly used string operations is concatenation. String concatenation is just a fancy programming word for joining strings together by appending one string to the end of another string.…
Read article →How to get CPU information.
How To Get CPU Information. The CPU (central processing unit), often called simply processor, is one of the essential components of your computer. It performs all types of data processing operations, and it often referred to as the computer’s brain. Have you ever wondered what type of CPU you have…
Read article →How to Install and Use Curl on Ubuntu 18.04
How To Install And Use Curl On Ubuntu 18.04 In this tutorial, we will show you how to install Curl on Ubuntu 18.04. You are following a tutorial where a file is downloaded using the curl utility. You run the command and you get the following error message curl command not found. There’s nothing to…
Read article →How to Get the Size of a Directory.
How To Get The Size Of A Directory. When listing the contents of a directory using the ls command, you may have noticed that the size of the directories is almost always 4096 bytes (4 KB). That’s the size of space on the disk that is used to store the meta-information for the directory, not…
Read article →How to use cut command.
How To Use Cut Command. In this article, we will show you how to use the cut command through practical examples and detailed explanations of the most common options. There are many utilities available in Linux and Unix systems that allow you to process and filter text files. cut is a command-line…
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