How do I permanently modify the kernel command line?

Solution Verified - Updated -

Issue

  • Red Hat Enterprise Linux 7 and RHEL8 has a boot loader (GRUB2) that differs from GRUB in RHEL5 and RHEL6.
  • How do I modify the kernel command line (and, thus, kernel boot parameters) in Red Hat Enterprise Linux 7/8 with GRUB2 installed as a boot loader?

Environment

  • Red Hat Enterprise Linux (RHEL) 7, 8 and 9
  • GRUB2 boot loader

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