Here’s how you can append text to a file when using the sudo command on Linux or Unix: Open a terminal and navigate to the directory containing the file you want to append text to. Use the following command to open the file with the sudo privilege: sudo nano /path/to/file Replace /path/to/file with the path … Read more

Here’s how you can extract multiple tar.gz files in a directory on Linux or Unix: Navigate to the directory containing the tar.gz files: cd /path/to/directory Use the following command to extract all tar.gz files in the directory: for i in *.tar.gz; do tar xvf “$i”; done This command will extract each tar.gz file in the … Read more

Here’s how you can configure Nginx to perform SSL/TLS passthrough with TCP load balancing: Install Nginx: sudo apt-get update sudo apt-get install nginx Create a new Nginx configuration file in the sites-available directory: sudo nano /etc/nginx/sites-available/<your_site> Replace <your_site> with the desired name for your site. Add the following content to the file to configure Nginx … Read more

Here’s how you can install tinc VPN on Ubuntu Linux 16.04 LTS: Update your system: sudo apt-get update sudo apt-get upgrade Install tinc VPN: sudo apt-get install tinc Create a tinc network: sudo mkdir /etc/tinc/<network_name> sudo tincd -n <network_name> -K Replace <network_name> with the desired name for your tinc network. Create a configuration file for … Read more

Here’s how you can allow root login from one IP address using SSH public keys in a Linux environment: Make sure the target machine has an SSH server installed, such as OpenSSH. On the target machine, open the SSH configuration file, typically located at /etc/ssh/sshd_config. Find the line that starts with PermitRootLogin and set it … Read more

You can prevent unprivileged users from viewing the dmesg logs on Linux by using the following steps: Edit the sysctl configuration file: sudo nano /etc/sysctl.conf Add the following line to the end of the file: kernel.dmesg_restrict = 1 Save and close the file. Reload the sysctl configuration: sudo sysctl -p After these steps, unprivileged users … Read more

To delete files on SUSE Enterprise Linux, you can use the “rm” command in the terminal. Here’s the basic syntax: rm <file_name> To remove a directory and its contents, you can use the “-r” or “–recursive” option: rm -r <directory_name> Keep in mind that the “rm” command is permanent and the deleted files cannot be … Read more

The sed -i command on Linux and Unix systems can overwrite symbolic links (symlinks) if not used with caution. To prevent sed -i from overwriting symlinks, you can use the following methods: Use a temporary file: sed ‘s/old-text/new-text/g’ inputfile > tempfile && mv tempfile inputfile This method creates a temporary file, modifies its content, and … Read more

Here are the steps to install the LAMP stack on Debian 9 Stretch: Install Apache Web Server: sudo apt-get update sudo apt-get install apache2 Install MySQL Server: sudo apt-get install mysql-server During the installation, you’ll be prompted to set a root password for MySQL. Install PHP: sudo apt-get install php libapache2-mod-php php-mysql Configure Apache to … Read more

To upgrade from Debian Linux 8 Jessie to Debian 9 Stretch using command line over an SSH-based session, follow these steps: Log in to your Jessie system using SSH: ssh user@hostname Update the package index: sudo apt-get update Upgrade the system to the latest version of Jessie: sudo apt-get upgrade Make a backup of important … Read more