How to manually modify the boot parameter in grub before the system boots

Solution Verified - Updated -

Issue

  • How do I manually modify the boot parameter in GRUB before system boot?
  • Need to test a change to the kernel boot options.
  • How to edit the kernel options in GRUB.
  • How to edit GRUB file after changing root and swap logical volume names?

Environment

  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

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