It’s important to be cautious when using the killall command, especially with sudo, as it can terminate processes indiscriminately. Killing SSH connections might disrupt legitimate connections and potentially cause issues.

If you need to terminate specific SSH tunneling connections, it’s better to identify the process IDs (PIDs) associated with those connections and then use kill with the specific PIDs. Here’s a safer way to do it:

1. List SSH Processes: First, list the SSH processes to identify the ones you want to terminate. You can use the ps command with grep to filter SSH processes:

User management is an essential part of maintaining a secure and organized Ubuntu system. This guide provides you with various commands and procedures for managing users on your Ubuntu system.

Listing All Users

To list all users on your system, you can use the following command:

Secure Copy Protocol (SCP) is a command-line tool that allows you to securely copy files and directories between your local machine and a remote server over SSH. Here’s how you can use SCP to copy files in both directions: from your local machine to a remote server and from a remote server to your local machine.

Copying from Local to Remote (Upload)

To copy a file from your local machine to a remote server, use the following command:

If you want to see detailed boot messages instead of the splash screen when your Ubuntu system starts up, you can enable verbose mode by following these steps:

1. Open a terminal window.

2. Edit the Grub configuration file by running the following command:

   1	sudo nano /etc/default/grub

   This will open the Grub configuration file in the Nano text editor.

3. In the Grub configuration file, look for the line that starts with GRUB_CMDLINE_LINUX_DEFAULT. This line controls the display of the splash screen during boot.

Network Manager is an essential service in many Linux distributions that allows you to manage network connections easily. Sometimes, you might encounter an issue where Network Manager doesn’t start automatically at boot. One common reason for this issue is misconfigurations in the Network Manager service file.

In this article, we’ll guide you on how to ensure Network Manager starts automatically at boot by removing the static-network-up line from the Network Manager service configuration file.

If you want to modify the /etc/init/failsafe.conf file to reduce the waiting time for the network to come up during system startup. Specifically, you want to remove the sleep 40 and sleep 50 commands from the network waiting section. Here’s how you can do it:

Note: Modifying system configuration files can have unintended consequences and may impact the stability and functionality of your system. Please make sure you have a backup of the original file and proceed with caution.