GNU Emacs Manual - Accumulating Text

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## Accumulating Text

Usually we copy or move text by killing it and yanking it, but there are other methods convenient for copying one block of text in many places, or for copying many scattered blocks of text into one place. To copy one block to many places, store it in a register (see section Registers). Here we describe the commands to accumulate scattered pieces of text into a buffer or into a file.

`M-x append-to-buffer`
  Append region to contents of specified buffer.
`M-x prepend-to-buffer`
  Prepend region to contents of specified buffer.
`M-x copy-to-buffer`
  Copy region into specified buffer, deleting that buffer's old contents.
`M-x insert-buffer`
  Insert contents of specified buffer into current buffer at point.
`M-x append-to-file`
  Append region to contents of specified file, at the end.

To accumulate text into a buffer, use `M-x append-to-buffer`. This reads a buffer name, then inserts a copy of the region into the buffer specified. If you specify a nonexistent buffer, `append-to-buffer` creates the buffer. The text is inserted wherever point is in that buffer. If you have been using the buffer for editing, the copied text goes into the middle of the text of the buffer, wherever point happens to be in it.

Point in that buffer is left at the end of the copied text, so successive uses of `append-to-buffer` accumulate the text in the specified buffer in the same order as they were copied. Strictly speaking, `append-to-buffer` does not always append to the text already in the buffer--it appends only if point in that buffer is at the end. However, if `append-to-buffer` is the only command you use to alter a buffer, then point is always at the end.

`M-x prepend-to-buffer` is just like `append-to-buffer` except that point in the other buffer is left before the copied text, so successive prependings add text in reverse order. `M-x copy-to-buffer` is similar except that any existing text in the other buffer is deleted, so the buffer is left containing just the text newly copied into it.

To retrieve the accumulated text from another buffer, use the command `M-x insert-buffer`; this too takes buffername as an argument. It inserts a copy of the text in buffer buffername into the selected buffer. You can alternatively select the other buffer for editing, then optionally move text from it by killing. See section Using Multiple Buffers, for background information on buffers.

Instead of accumulating text within Emacs, in a buffer, you can append text directly into a file with `M-x append-to-file`, which takes filename as an argument. It adds the text of the region to the end of the specified file. The file is changed immediately on disk.

You should use `append-to-file` only with files that are not being visited in Emacs. Using it on a file that you are editing in Emacs would change the file behind Emacs's back, which can lead to losing some of your editing.

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