Remove Key Password with OpenSSL
How do you remove a password from a .key file using OpenSSL. You will be prompted for your original password, so enter that first then the new key will be…
How to Force User to Change Password at Next Login in Linux
Using the passwd command, you can change a user’s password and settings related to password expiry. There are two possible ways to achieve this, as described in detail, below. Using…
How to enable/disable the firewall on Ubuntu 20.04 LTS
In this tutorial, you will learn: The default Ubuntu firewall is ufw, with is short for “uncomplicated firewall.” Ufw is a frontend for the typical Linux iptables commands, but it…
How to Fix “No route to host” SSH Error in Linux
SSH is the most secure means of connecting to Linux servers remotely. And one of the common errors encountered while using SSH is the “ssh: connect to host port 22:…
How to manually set up a Static or DHCP NIC in Ubuntu 20.04
How does it work? Netplan reads network configurations from /etc/netplan/*.yaml, written by administrators, installers, cloud image instantiations, or other OS deployments. During early boot, Netplan generates backend-specific configuration files in…
How To Install “net-tools” Package on Ubuntu / Debian
Package Description The NET-3 networking toolkit Quick Install Instructions of net-tools on Ubuntu Server. It’s Super Easy! Simply Copy (CTL-C) to copy the command and paste (CTL-V) it into your…
What is DNS, and How Does DNS Work? (Domain Name Server Fundamentals)
What if you had to memorize the IP address of every website that you wanted to visit? I bet you’d go crazy in no time! This is where DNS jumps…
How to correctly add a path to PATH?
The simple stuff Depending on whether you want to add ~/opt/bin at the end (to be searched after all other directories, in case there is a program by the same…
Linux/Uniux Shells
The shell can be defined as a command interpreter within an operating system like Linux/GNU or Unix. It is a program that runs other programs. The shell facilitates every computer…