(emacs)Buffers


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Using Multiple Buffers
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   The text you are editing in Emacs resides in an object called a
"buffer".  Each time you visit a file, a buffer is created to hold the
file's text.  Each time you invoke Dired, a buffer is created to hold
the directory listing.  If you send a message with `C-x m', a buffer
named `*mail*' is used to hold the text of the message.  When you ask
for a command's documentation, that appears in a buffer called `*Help*'.

   At any time, one and only one buffer is "selected".  It is also
called the "current buffer".  Often we say that a command operates on
"the buffer" as if there were only one; but really this means that the
command operates on the selected buffer (most commands do).

   When Emacs has multiple windows, each window has a chosen buffer
which is displayed there, but at any time only one of the windows is
selected and its chosen buffer is the selected buffer.  Each window's
mode line displays the name of the buffer that the window is displaying
(Note: Windows.).

   Each buffer has a name, which can be of any length, and you can
select any buffer by giving its name.  Most buffers are made by
visiting files, and their names are derived from the files' names.  But
you can also create an empty buffer with any name you want.  A newly
started Emacs has a buffer named `*scratch*' which can be used for
evaluating Lisp expressions in Emacs.  The distinction between upper
and lower case matters in buffer names.

   Each buffer records individually what file it is visiting, whether
it is modified, and what major mode and minor modes are in effect in it
(Note: Major Modes.).  Any Emacs variable can be made "local to" a
particular buffer, meaning its value in that buffer can be different
from the value in other buffers.  Note: Locals.

* Select Buffer
Creating a new buffer or reselecting an old one.
* List Buffers
Getting a list of buffers that exist.
* Misc Buffer
Renaming; changing read-onliness; copying text.
* Kill Buffer
Killing buffers you no longer need.
* Several Buffers
How to go through the list of all buffers and operate variously on several of them.

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