emerge:tldr:8649f

The command emerge -uDNav @world is used in the Gentoo Linux package management system. Let's break down each option and its purpose:

• emerge: This is the command used to manage packages in Gentoo Linux. It is used to install, update, or remove software packages.

• -u: This option stands for "upgrade" and tells emerge to upgrade installed packages to newer versions if available.

• -D: This option stands for "deep" and tells emerge to also update dependencies of installed packages.

• -N: This option stands for "newuse" and tells emerge to consider package.use changes as if they were new. It means that if there are USE flag changes in the package.use file, emerge will re-compile the package with the new USE flag settings.

• -a: This option stands for "ask" and tells emerge to prompt for confirmation before proceeding with any actions. It allows you to review the changes that will be made before applying them.

• -v: This option stands for "verbose" and tells emerge to display detailed output during the process.

• @world: This is a set name used in Gentoo Linux to refer to the currently installed packages on the system. By specifying @world, the command targets all packages in the world set, ensuring that all installed packages are considered for upgrade or update.

Overall, the command emerge -uDNav @world is used to upgrade all installed packages on a Gentoo Linux system, including their dependencies, considering any changes in USE flags, and prompting for confirmation before proceeding.