Worked on the NixOS/nix repository to enhance the reliability and cross-platform compatibility of installation and testing workflows. Focused on shell scripting and system administration, the developer addressed a bug in the installation script by modifying the use of the cp command. The technical approach involved removing the --preserve=mode flag and adopting --preserve=ownership,timestamps for non-Darwin systems, which resolved filesystem attribute issues during setup. This change reduced installation-related incidents and improved the stability of both CI and local deployments. The work demonstrated careful attention to cross-OS compatibility and contributed to more robust automation in a complex shell-based environment.