Bash One-liner to Set GRUB Timeout

To set GRUB timeout to 5 seconds, use this command. sed -i.bak 's/timeout=5/timeout=5/g' /boot/grub/grub.cfg To disable timeout (first option will be selected automatically) use this command. sed -i.bak 's/timeout=5/timeout=0/g' /boot/grub/grub.cfg ...