9. Selecting and Moving Text

Many Emacs commands operate on an arbitrary contiguous part of the current buffer. You can select some part of the buffer and edit only that part of the buffer. This selected buffer is called a region. You can select text in two ways:

• You use special keys to select text by defining a region between the cursor and the mark (which you set).
• If you are running XEmacs under X, you can also select text with the mouse.

9.1 Setting the Mark

C-SPC

This command will set the mark at the position of your cursor (set-mark-command). You can move your cursor around and the mark will stay there.

C-x C-x

Interchange mark and point (exchange-point-and-mark). Since Emacs will have only one cursor, after you move the cursor it will be unable to show you where you set the the mark. In order to see the mark you can type the command C-x C-x which will put your cursor on the position of your mark and your mark on the position of your cursor. Use the command again to reset the positions of your cursor and mark.

C-<

This command will push the mark at the beginning of the buffer without changing the position of your cursor.

C->

This command will push the mark at the end of the buffer without changing the position of your cursor.

9.2 Selecting Text with Mouse

1. Move the mouse cursor over the character at the beginning of the region of text you want to select.
2. Press and hold the left mouse button.
3. While holding the left mouse button down, drag the cursor to the character at the end of the region of text you want to select.
4. Release the left mouse button.

See section `Selecting Text with the Mouse' in XEmacs User's Manual, for more information regarding the Mouse and additional mouse operations.

9.3 Operating on the Region

• Kill the text with C-w. For example if you want to kill a paragraph, position the cursor to the beginning of the paragraph and type C-SPC. Then go to the end of the paragraph and type C-w. The entire paragraph will be deleted. You can also select the text with a mouse and type C-w to kill the entire region. See section `Killing' in XEmacs User's Manual, for more information.

• Save the text in a buffer or a file (see section `Accumulating Text' in XEmacs User's Manual).
• You can convert the case of the text with C-x C-l or C-x C-u If you type C-x C-u the selected text will become all upper-case. If you type C-x C-l the selected text will become all lower-case.
• Print hardcopy with M-x print-region. See section `Hardcopy' in XEmacs User's Manual, for more information. This command will print a hardcopy of only the selected text.
• Indent it with C-x TAB or C-M-\ See section `Indentation' in XEmacs User's Manual, for more information.

9.4 Moving Text

C-y

This command will yank or paste the last killed text (yank).

M-w

Save region as last killed text without actually killing it (copy-region-as-kill). You can use this command to copy a selected region and then yank (or paste) it without actually removing it from the buffer.

C-M-w

Append next kill to last batch of killed text (append-next-kill). This command will append whatever you killed last to what you kill now. Then later you will be able to yank the entire appended text from the kill ring.

9.5 Accumulating Text

The following commands can be used for accumulating text from different buffers into one place or for copying one region of text into many buffers:

M-x append-to-buffer

Append region to contents of specified buffer (append-to-buffer). After you type in this command and press RET, Emacs will prompt you for a buffer name. You will see a message in the echo area:

Append to buffer: (default <buffer name>)

After you type in a buffer name, a copy of the region will be inserted at the location of the cursor into that buffer. If there is no buffer with the name given by you, Emacs will create a new buffer with that name. By default the cursor's position in the <buffer name> is at the end.

M-x prepend-to-buffer

Prepend region to contents of specified buffer. This command is similar to the above command except that the cursor in the buffer (by default) is at the beginning rather than at the end.

M-x copy-to-buffer

Copy region into specified buffer, deleting that buffer's old contents. This command will also prompt you for a buffer name.

M-x insert-buffer

Insert contents of specified buffer into current buffer at point. This command will prompt you for a buffer name which you want to be copied into the current buffer at the location of the cursor.

M-x append-to-file

This command will prompt you for a filename and append the region to the end of the contents of the specified file.

See section `Accumulating Text' in XEmacs User's Manual, for more information regarding this topic. You can also use rectangle commands for operating on rectangular areas of text. See section `Rectangles' in XEmacs User's Manual, for more information regarding rectangle commands.

Emacs also provides registers which serve as temporary storage for text or positions. Each register has a one character name and they can store regions, a rectangle, or a mark i.e. a cursor position. Whatever you store in register stays there until you store something else in that register. To find out about commands which manipulate registers See section `Registers' in XEmacs User's Manual.