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

Solution Verified - Updated 2018-04-14T00:50:22+00:00 -

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

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