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add-apt-repository:tldr:f7b66
The command "add-apt-repository" is a tool used in Ubuntu and Debian-based operating systems to add external software repositories to the system's package manager.
The ${repository_spec} is a placeholder for the specific details of the repository that you want to add. It typically includes the repository's URL or identifier.
When you run the command "add-apt-repository ${repository_spec}", the system will connect to the specified repository and download the repository's keyring, which contains the public keys used to verify the authenticity of the software packages provided by the repository.
Once the keyring is downloaded, the command will update the system's package list to include the new repository. This enables you to install and update software packages from that repository using the package manager (such as apt-get or apt).