virt-install is a command-line tool used to create virtual machines in KVM. Here are the steps to install FreeBSD or CentOS as a guest operating system using virt-install: Open a terminal window on your KVM host machine. Type the following command to start the installation process: virt-install \ –name guest_name \ –memory 2048 \ –vcpus … Read more

You can use the virsh command in KVM (Kernel-based Virtual Machine) to manage guest operating systems, including starting, stopping, and restarting them. Here’s how to do it: Open a terminal window on your KVM host machine. Type the following command to display a list of all running and stopped virtual machines: virsh list –all This … Read more

You can use the ifconfig command in Linux to display a list of available network interfaces on your system. Here’s how to do it: Open a terminal window on your Linux machine. Type the following command to display a list of all available network interfaces: ifconfig -a This will show all the network interfaces, even … Read more

You can use the rsync command with the –progress option to display a progress bar while copying files. Here’s how to do it: Open a terminal window on your Linux machine. Type the following command to copy a file or directory from the source to the destination, and show a progress bar: rsync –progress -r … Read more

You can use Nginx to block and deny access to specific IP addresses or network subnets by adding a deny directive in your Nginx configuration file. Here’s how to do it: Open your Nginx configuration file in a text editor. The file is typically located at /etc/nginx/nginx.conf or /etc/nginx/conf.d/default.conf. Inside the http block, add a … Read more

You can use the qpdf command-line tool to remove a password from a PDF file in Linux. Here’s how to do it: Install the qpdf package if it’s not already installed on your system. You can do this using the package manager for your Linux distribution. For example, in Ubuntu or Debian, you can run: … Read more

To force a redirect from www.domain.com to domain.com using Nginx, you can add a server block to your Nginx configuration file with a server_name directive that includes both the www and non-www versions of your domain name, and a return directive with a 301 status code to redirect requests to the non-www version. Here’s an … Read more

In Linux/Unix, you can use the rmdir or rm command to remove a directory. Here’s how to do it: Open a terminal window. Navigate to the parent directory of the directory you want to remove. Type the following command to remove an empty directory using the rmdir command: rmdir directory_name Replace “directory_name” with the name … Read more

In Linux/Unix, you can use a for loop to remove multiple files at once. Here’s how to do it: Open a terminal window. Navigate to the directory where the files you want to remove are located. Type the following command to start the for loop: for file in file1 file2 file3 Replace “file1”, “file2”, and … Read more

In Unix/Linux, you can use the uname command to find the operating system release and version number. Here’s how to do it: Open a terminal window. Type the following command and press Enter: uname -a This will display a long list of system information, including the operating system release and version number. Look for the … Read more