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Ubuntu 18.04 remove all unused old kernels
You can remove all unused old kernels on Ubuntu 18.04 using the following steps:rn rn Check the installed kernels: Run the following command to check the list of installed kernels on your system: rn rn rn rn dpkg --list | grep linux-imagern rn rnThis will show a list of all the installed kernels, in
Change netplan renderer from networkd to NetworkManager
To change the netplan renderer from networkd to NetworkManager on Ubuntu, you can follow these steps:rn rn Open the netplan configuration file: Run the following command to open the netplan configuration file in a text editor: rn rn rn rn sudo nano /etc/netplan/50-cloud-init.yamlrn rn rn rn Change t
Apache with Let’s Encrypt Certificates on CentOS 8/9
To set up Apache with Let’s Encrypt Certificates on CentOS 8/9, you can follow these steps: n n Install the certbot-apache package using the command: sudo dnf install certbot-apache n Run the command to obtain the SSL certificate: sudo certbot --authenticator apache -installer apache n Follow
How To Install MariaDB on CentOS 8
Here are the steps to install MariaDB on CentOS 8:rn rn Update the package manager: Run the following command to update the package manager and ensure that it has the latest package information: rn rn rn rn sudo dnf update rn rn rn rn Add the MariaDB repository: To install MariaDB on CentOS 8, you w
How to install whois on RHEL 8 / CentOS 8
To install the whois command on RHEL 8 / CentOS 8, you can use the package manager dnf :rn rn rn sudo dnf install whoisrn rn rnThis will install the whois package, which provides the whois command-line tool for querying domain name registration information. Once installed, you can use the whois comm
How to install wget on CentOS 8/9 using the yum/dnf command
To install wget on CentOS 8/9 using the yum/dnf command, use the following command: n n n sudo dnf install wget n n n You may need to run sudo dnf update before running the above command to ensure that you have the latest package list. n You can also use yum instead of dnf. n n n sudo yum install wg
CentOS 8 dig command not found – How to install dig on CentOS 8
The dig command is not installed by default on CentOS 8, but it can be easily installed using the package manager. Here are the steps to install dig on CentOS 8:rn rn Update the package manager: Run the following command to update the package manager and ensure that it has the latest package informa
Linux run a command with a time limit (timeout)
There are a few ways to run a command with a time limit (timeout) on Linux. Here are a few options: n n Using the timeout command: The timeout command is a coreutils utility that can be used to run a command with a specified time limit. The syntax is as follows: n n n n timeout <duration> <
How to set up a firewall using FirewallD on CentOS 8
To set up a firewall using FirewallD on CentOS 8, you can follow these steps:rn rn Make sure FirewallD is installed on your system by running the command: rn rn rn rn sudo yum install firewalldrn rn rn rn Start and enable the firewall service by running the commands: rn rn rn rn sudo systemctl start
How To Protect SSH With Fail2Ban on CentOS 8
To protect SSH with Fail2Ban on CentOS 8, you can follow these steps:rn rn Install Fail2Ban by running the command sudo yum install fail2ban . rn Create a new Fail2Ban configuration file for SSH by running the command sudo nano /etc/fail2ban/jail.d/sshd.local . rn In the file, add the following conf
How To Enable and Install EPEL Repo on CentOS 8
Here's how to enable and install the EPEL (Extra Packages for Enterprise Linux) repository on CentOS 8:rn rn Download the EPEL repository package by running the following command: rn rn rn rn sudo yum install epel - release rn rn rn rn Verify that the EPEL repository has been added by running the fo
CentOS 8 Change Hostname (computer name) command
To change the hostname on a CentOS 8 system using the command line, you can use the hostnamectl command. To set a new hostname, use the following command:rn rn rn sudo hostnamectl set -hostname newhostnamern rn rnReplace newhostname with the desired hostname for your system. To verify the host
How To Upgrade Ubuntu 18.04 to 20.04 LTS using command line
Here are the steps to upgrade Ubuntu 18.04 LTS to 20.04 LTS using the command line:rn rn Start by making sure your system is up-to-date by running the following commands: rn rn rn rn sudo apt update rnsudo apt upgradern rn rn rn Install the update-manager-core package, if it's not already installed:
Add a new user account with admin access on Linux
To add a new user account with admin access on Linux, use the useradd command followed by the -G option and the group name “sudo” or “admin”. For example: n n n sudo useradd -m -G sudo newuser n n n This will create a new user named “newuser” and add them to the &
Ubuntu configuring SSH Key-based Authentication
SSH key-based authentication is a more secure way to log in to a remote server than using a password. It uses a pair of private and public keys to authenticate the user, rather than a password. In this way, only the user who has the private key can log in to the server. n Here are the steps to confi
Linux find Windows 10/11 OEM product key command
The product key for Windows 10/11 OEM (Original Equipment Manufacturer) is typically stored in the firmware of the device. You can use the following command on Linux to retrieve the product key:rn rn rn sudo cat /sys/firmware/acpi/tables/MSDMrn rn rnThis command will print the product key in the out
How to configure Nginx with Let’s Encrypt on CentOS 8
To configure Nginx with Let’s Encrypt on CentOS 8 n n Install certbot: n n n n sudo yum install certbot-nginx n n n n Obtain a SSL certificate: n n n n sudo certbot --nginx n n n n Follow the prompts to enter your email address and agree to the terms of service n Choose the domain name you want to g
How do I count how many processes are running in Linux?
There are several ways to count the number of processes running on a Linux system. Here are a few methods:rn rn Using the ps command: The ps command provides a snapshot of the current processes on the system. To count the number of running processes, you can use the following command: rn rn rn rn ps
CentOS 8/9 update installed packages for security
To update installed packages for security on CentOS 8/9, you can use the yum command as the root user or with sudo.rn rn Update the package index by running the command sudo yum update . This command will update all installed packages to the latest version. rn You can also update specific packages b
How To Remove Santa Hat in VLC Player Permanently
The Santa hat feature in VLC Player is a holiday-themed overlay that can be enabled during the Christmas season. To remove the Santa hat permanently in VLC Player, you can follow these steps:rn rn Open VLC Player on your computer. rn Click on the "Tools" menu, then select "Preferences." rn In the "P
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