GNU Emacs Manual. Node: Select Buffer

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13.1: Creating and Selecting Buffers

C-x b buffer RET

Select or create a buffer named buffer (switch-to-buffer).

C-x 4 b buffer RET Similar, but select buffer in another window (switch-to-buffer-other-window).
C-x 5 b buffer RET Similar, but select buffer in a separate frame (switch-to-buffer-other-frame).

To select the buffer named bufname, type C-x b bufname RET. This runs the command switch-to-buffer with argument bufname. You can use completion on an abbreviation for the buffer name you want (see Completion). An empty argument to C-x b specifies the most recently selected buffer that is not displayed in any window.

Most buffers are created by visiting files, or by Emacs commands that want to display some text, but you can also create a buffer explicitly by typing C-x b bufname RET. This makes a new, empty buffer that is not visiting any file, and selects it for editing. Such buffers are used for making notes to yourself. If you try to save one, you are asked for the file name to use. The new buffer's major mode is determined by the value of default-major-mode (see Major Modes).

Note that C-x C-f, and any other command for visiting a file, can also be used to switch to an existing file-visiting buffer. See Visiting.

Emacs uses buffer names that start with a space for internal purposes. It treats these buffers specially in minor ways---for example, by default they do not record undo information. It is best to avoid using such buffer names yourself.

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