Key issues with rob bash build include managing dependencies, handling formatting, and ensuring compatibility across platforms. To address dependency challenges, utilize package managers like apt or yum to install necessary dependencies. For formatting concerns, leverage tools like bashfmt or shellcheck to enforce consistent code style. To ensure cross-platform compatibility, employ portability tools like GNU or POSIX utilities, and test scripts on multiple platforms.

To optimize rob bash build productivity, adopt an iterative approach, break down complex scripts into smaller modules, and utilize version control for code management. Leverage autocomplete features for faster command entry, and employ debugging tools like bashdb or PDB to pinpoint errors. Additionally, consider using pre-built Docker containers to ensure consistent build environments across platforms, reducing setup and maintenance time.