grubby

Tool for configuring grub and zipl bootloaders. More information: https://manned.org/grubby.8.

• Add kernel boot arguments to all kernel menu entries:

sudo grubby --update-kernel=ALL --args 'quiet console=ttyS0'

• Remove existing arguments from the entry for the default kernel:

sudo grubby --update-kernel=DEFAULT --remove-args quiet

• List all kernel menu entries:

sudo grubby --info=ALL