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21.5.2. Editing a Menu Entry

If required to prepare a new GRUB 2 file with different parameters, edit the values of the GRUB_CMDLINE_LINUX key in the /etc/default/grub file. Note that you can specify multiple parameters for the GRUB_CMDLINE_LINUX key. For example:
GRUB_CMDLINE_LINUX="console=tty0 console=ttyS0,9600n8"
Where console=tty0 is the first virtual terminal and console=ttyS0 is the serial terminal to be used.
Changes to /etc/default/grub require rebuilding the grub.cfg file as follows: