How do I permanently modify the kernel command line in RHEL 8 or 9?

Solution Verified - Updated -

Issue

  • The boot loader Grand Unified Boot Loader (GRUB2) in RHEL 8 or 9 differs from the GRUB2 in RHEL 7.
  • How do I modify the kernel command line (and, thus, kernel boot parameters) in Red Hat Enterprise Linux 8/ 9?

Environment

  • Red Hat Enterprise Linux 9 Beta
  • Red Hat Enterprise Linux 8
  • GRUB2 boot loader

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