nixos-container:tldr:c751c

This command is used to edit and update the configuration file of a NixOS container.

Here is the breakdown of the command:

1. sudo: This command is used to execute the following command as a superuser or root user. It is necessary in this case because editing system files like configuration files usually require elevated privileges.

2. $EDITOR: This is a placeholder for an environment variable that represents the default text editor in your system. It allows you to specify a custom editor if needed. For example, you might define the $EDITOR variable as vim or nano to use a specific editor.

3. /var/lib/container/${container_name}/etc/nixos/configuration.nix: This is the path to the configuration file of the NixOS container you want to edit. ${container_name} is a placeholder for the actual name of the container. You need to replace ${container_name} with the name of your container.

4. &&: This is a logical operator that means "and". It is used here to execute the next command only if the previous command succeeds.

5. sudo nixos-container update ${container_name}: This command updates the NixOS container specified by ${container_name}. The nixos-container command is used to manage NixOS containers, and the update subcommand updates the container to the latest configuration.

So, when you run this command, it will open the configuration file for editing with the specified editor ($EDITOR). After you save and close the editor, it will automatically update the container using the modified configuration.