The GID associated with a file-system object. Each file-system object has a user ID (the file UID, commonly referred to as the file’s owner), a group ID (the file GID, commonly referred to as the file’s group), and three sets of permission bits, known as owner, group, and other permissions. The first set of bits controls access to the object by the owner, the second controls access by members of the group, and the third controls access by everyone else. See also process GID.