Which of these is NOT a main user job of the RSH?

The role of the RSH (Remote Shell) primarily revolves around facilitating system administration tasks, maintenance jobs, and database management. System administration includes managing and configuring computer systems, while maintenance jobs typically involve routine checks and updates to ensure everything functions smoothly. Database upload/download jobs are also core to the RSH's responsibilities, as they enable users to move data efficiently between systems.

Software development, however, is distinct from the primary responsibilities associated with the RSH. This role usually requires a different set of tools and environments specifically designed for developing and deploying applications. While software development may leverage remote shell access for compiling code or running scripts, it does not constitute a main user job of the RSH itself. Instead, it falls outside the primary purpose of what RSH is designed to accomplish. This distinction clarifies why software development is the correct answer to the question.