Emacs/emacs/Misc-Buffer
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19.3 Miscellaneous Buffer Operations
- C-x C-q
- Toggle read-only status of buffer (
read-only-mode
). - M-x rename-buffer RET
buffer
RET - Change the name of the current buffer.
- M-x rename-uniquely
- Rename the current buffer by adding ‘
<number>
’ to the end. - M-x view-buffer RET
buffer
RET - Scroll through buffer
buffer
. See View Mode.
A buffer can be read-only, which means that commands to insert
or delete its text are not allowed. (However, other commands, like
C-x RET f, can still mark it as modified, see Text Coding). The mode line indicates read-only buffers with ‘%%
’ or
‘%*
’ near the left margin. See Mode Line. Read-only buffers
are usually made by subsystems such as Dired and Rmail that have
special commands to operate on the text. Visiting a file whose access
control says you cannot write it also makes the buffer read-only.
The command C-x C-q (read-only-mode
) makes a read-only
buffer writable, and makes a writable buffer read-only. This works by
setting the variable buffer-read-only
, which has a local value
in each buffer and makes the buffer read-only if its value is
non-nil
. If you change the option view-read-only
to a
non-nil
value, making the buffer read-only with C-x C-q
also enables View mode in the buffer (see View Mode).
M-x rename-buffer changes the name of the current buffer. You specify the new name as a minibuffer argument; there is no default. If you specify a name that is in use for some other buffer, an error happens and no renaming is done.
M-x rename-uniquely renames the current buffer to a similar
name with a numeric suffix added to make it both different and unique.
This command does not need an argument. It is useful for creating
multiple shell buffers: if you rename the *shell*
buffer, then
do M-x shell again, it makes a new shell buffer named
*shell*
; meanwhile, the old shell buffer continues to exist
under its new name. This method is also good for mail buffers,
compilation buffers, and most Emacs features that create special
buffers with particular names. (With some of these features, such as
M-x compile, M-x grep, you need to switch to some other
buffer before using the command again, otherwise it will reuse the
current buffer despite the name change.)
The commands M-x append-to-buffer and M-x insert-buffer can also be used to copy text from one buffer to another. See Accumulating Text.
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