Developed and delivered the AuthorizedKeysCommand feature for the ustclug/Linux201-docs repository, enabling SSH servers to retrieve public keys dynamically through a specified shell command. This approach centralized SSH key management and improved consistency across server provisioning, reducing the need for manual key distribution and enhancing overall security. The implementation involved shell scripting and careful documentation using Markdown, ensuring that both the technical solution and its usage were clearly communicated. System administration skills were applied to integrate the feature seamlessly into existing workflows, and the work included updating relevant warning sections to reflect the new functionality and its operational considerations.