Worked on improving the reliability of parallel data restoration for the mg5amcnlo/mg5amcnlo repository, focusing on macOS compatibility. Addressed a critical bug by replacing the unavailable nproc command with sysctl for accurate CPU core detection on macOS systems. Enhanced the shell script further by invoking xargs with the -S1024 option to prevent command length issues during parallel untar operations. This solution, implemented in Shell and leveraging system administration expertise, reduced failure rates in continuous integration and developer environments. The fix contributed to smoother builds and more reproducible results, ensuring consistent data restoration workflows across different operating systems.