(emacs)Mark Ring

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The Mark Ring

   Aside from delimiting the region, the mark is also useful for
remembering a spot that you may want to go back to.  To make this
feature more useful, each buffer remembers 16 previous locations of the
mark, in the "mark ring".  Commands that set the mark also push the old
mark onto this ring.  To return to a marked location, use `C-u C-SPC'
(or `C-u C-@'); this is the command `set-mark-command' given a numeric
argument.  It moves point to where the mark was, and restores the mark
from the ring of former marks.  Thus, repeated use of this command
moves point to all of the old marks on the ring, one by one.  The mark
positions you move through in this way are not lost; they go to the end
of the ring.

   Each buffer has its own mark ring.  All editing commands use the
current buffer's mark ring.  In particular, `C-u C-SPC' always stays in
the same buffer.

   Many commands that can move long distances, such as `M-<'
(`beginning-of-buffer'), start by setting the mark and saving the old
mark on the mark ring.  This is to make it easier for you to move back
later.  Searches set the mark if they move point.  You can tell when a
command sets the mark because it displays `Mark Set' in the echo area.

   If you want to move back to the same place over and over, the mark
ring may not be convenient enough.  If so, you can record the position
in a register for later retrieval (Note: RegPos.).

   The variable `mark-ring-max' specifies the maximum number of entries
to keep in the mark ring.  If that many entries exist and another one
is pushed, the last one in the list is discarded.  Repeating `C-u
C-SPC' circulates through the positions currently in the ring.

   The variable `mark-ring' holds the mark ring itself, as a list of
marker objects in the order most recent first.  This variable is local
in every buffer.

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