" I also found that I couldn't redirect STDERR with no also redirecting STDOUT. The solution in which programA sends STDOUT to STDIN of programB, then redirects STDERR to a log file: programA two> /var/log/programA.log and chose to work with /boot/grub2/ as their GRUB prefix in lieu of the de-facto /boot/grub/ (and with the history, they did not do