Heart failure (HF), often referred to as congestive heart failure (CHF), occurs when the heart is unable to pump sufficiently to maintain blood flow to meet the body's needs. The terms chronic heart failure (CHF) or congestive cardiac failure (CCF) are often used interchangeably with congestive heart failure.
GRUB Rescue Shell. GRUB Rescue offers a limited set of commands to help you configure a one-time normal boot and repair GRUB from your operating system. Just because GRUB doesn't load properly doesn't mean your operating system is unbootable; the Linux filesystem is usually still intact and in good condition.
GRUB was created by Erich Stefan Boleyn and has been further developed under the GNU project as GNU GRUB. The original package, sometimes known as GRUB Legacy, is still available for download but no longer being developed. GRUB's name is a reference to the Grand Unified Theory (GUT) of physics.