You can append text to the end of a file in Linux using the echo command and the >> operator. The echo command outputs the specified text, and the >> operator appends the output to the end of the specified file. Here’s an example of how to append text to the end of a file … Read more

If your MacOS keeps asking for the passphrase for your ssh key after an upgrade or a reboot, there are a few possible solutions: Use ssh-add to add the key to the ssh-agent: eval “$(ssh-agent -s)” ssh-add -K ~/.ssh/id_rsa The -K option stores the passphrase in the Keychain, so you won’t be prompted for it … Read more

In Linux or Unix, you can copy a single file to multiple directories using a loop in a shell script. Here’s an example script that uses the cp command to copy the file file.txt to multiple directories dir1, dir2, and dir3: #!/bin/bash directories=(dir1 dir2 dir3) file=file.txt for dir in “${directories[@]}”; do cp “$file” “$dir” done … Read more

You can force an ssh client to use only password authentication when public key authentication is also configured by using the -o PreferredAuthentications=password option when connecting to the server. For example: ssh -o PreferredAuthentications=password user@server This option tells ssh to only use password authentication and ignore any public key authentication that may be configured. The … Read more

The error “Error while loading shared libraries: libXrender.so.1” occurs because the system is unable to find the shared library libXrender.so.1, which is needed to run a program. To resolve this error, you can install the missing library by running the following command: sudo apt-get install libxrender1 This will install the libXrender.so.1 library and its dependencies … Read more

To create a new sudo user on an Ubuntu Linux server, you can follow these steps: Log in to your Ubuntu Linux server as the root user or as a user with sudo privileges. Run the following command to create a new user: sudo adduser <username> Replace <username> with the desired username for the new … Read more

To log a real user’s IP address with Nginx in log files, you can use the $remote_addr variable. This variable contains the IP address of the user making the request. Here’s how you can configure Nginx to log the real user’s IP address in the log files: Open the Nginx configuration file: The Nginx configuration … Read more

To zip a folder in Ubuntu Linux / Debian Linux, you can use the zip command. Here’s how you can use it: Open a terminal window: To open a terminal window, click on the terminal icon in the applications menu or press Ctrl + Alt + T. Navigate to the folder you want to zip: … Read more

Mapping a static IP address using dnsmasq under LXD (Linux Containers) can be done as follows: Install dnsmasq: First, you will need to install dnsmasq on the host machine using the following command: sudo apt-get install dnsmasq Configure dnsmasq: Next, you will need to configure dnsmasq to assign a static IP address to a container. … Read more

LXD is a container hypervisor, which allows you to run multiple isolated Linux containers on a single host. If you want to run LXD containers under a KVM or Xen virtual machine, you will need to do the following: Create a virtual machine: First, you will need to create a new virtual machine using KVM … Read more