How to change the grub timeout period in Red Hat Enterprise Linux?

Solution Verified - Updated -

Issue

  • How to increase the grub timeout so that it will wait longer before booting.
  • How to change the grub timeout so that it will never expire before booting, without user input.
  • How to disable or hide the grub menu so that it will not show during boot.
  • The grub screen is too fast and does not show on boot, but the system boots with no issue. How can we correct the timeout so we have more time to choose a kernel?

Environment

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

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