Rahul Sahu

To install Docker on an Amazon Linux 2 EC2 instance, you can use the following steps: Connect to your EC2 instance via SSH. Update the package index by running the following command: sudo yum update -y Add the Docker repository to your system by running the following command: sudo amazon-linux-extras install docker Install Docker by … Read more

o set or change the hostname on an Amazon Linux EC2 instance, you can use the hostnamectl command. Here are the steps to set the hostname: Connect to your EC2 instance via SSH. Use the following command to set the hostname: sudo hostnamectl set-hostname new-hostname Replace new-hostname with the desired hostname. Verify the hostname has … Read more

You can switch the boot target to text or GUI mode in a system running Linux with systemd by performing the following steps: To switch to text mode, enter the following command in the terminal: sudo systemctl set-default multi-user.target To switch to GUI mode, enter the following command in the terminal: sudo systemctl set-default graphical.target … Read more

You can reinstall a package on a system running CentOS or RHEL using the dnf command. The dnf command is a package manager for RPM-based Linux distributions, such as CentOS and RHEL. Here’s an example of how to reinstall a package using the dnf command: sudo dnf reinstall package_name This command will reinstall the package … Read more

You can disable core dumps in Linux, including systems that use systemd, by performing the following steps: Change the core dump pattern to prevent core dumps from being written to disk by adding the following line to the file /etc/sysctl.conf: fs.suid_dumpable = 0 Reload the sysctl configuration by running: sudo sysctl -p Check if core … Read more

Upgrading Debian 10 to Debian 11 Bullseye using the command line interface (CLI) involves several steps: Make sure your system is up-to-date by running: sudo apt update && sudo apt upgrade Backup your important data and configuration files, it’s always a good idea to have a backup before upgrading. Edit the sources list file /etc/apt/sources.list … Read more

The “find” command is a powerful command-line utility that can be used to search for files and directories in one or more directories. Here’s an example of how to search for files with the “.txt” extension in the directories “/home/user/dir1” and “/home/user/dir2”: find /home/user/dir1 /home/user/dir2 -name “*.txt” This command uses the “find” command with the … Read more

You can generate a QR code for a WireGuard configuration on Linux by using the qrencode command. The qrencode command is a command-line utility to generate QR codes. Here’s an example of how to use the qrencode command to generate a QR code for a WireGuard configuration: Create a WireGuard configuration file and save it … Read more

sshpass is a command-line utility that allows you to provide a password for an SSH login on the command-line, rather than being prompted for it interactively. Here’s an example of how to install sshpass on macOS/OS X: Install Homebrew: The easiest way to install sshpass on macOS/OS X is by using the package manager Homebrew. … Read more

You can stop the cat command in Linux by sending an interrupt signal (CTRL + C) to the terminal where the command is running. When you press CTRL + C it sends an interrupt signal to the process running in the terminal. This signal causes the process to terminate immediately. Alternatively, you can also stop … Read more