Here are special commands and techniques for putting in and taking out blank lines.
When you want to insert a new line of text before an existing line, you
can do it by typing the new line of text, followed by RET.
However, it may be easier to see what you are doing if you first make a
blank line and then insert the desired text into it. This is easy to do
using the key C-o (
open-line), which inserts a newline
after point but leaves point in front of the newline. After C-o,
type the text for the new line. C-o F O O has the same effect as
F O O RET, except for the final location of point.
You can make several blank lines by typing C-o several times, or by giving it a numeric argument to tell it how many blank lines to make. See section Numeric Arguments, for how. If you have a fill prefix, then C-o command inserts the fill prefix on the new line, when you use it at the beginning of a line. See section The Fill Prefix.
The easy way to get rid of extra blank lines is with the command
C-x C-o (
delete-blank-lines). C-x C-o in a run of
several blank lines deletes all but one of them. C-x C-o on a
solitary blank line deletes that blank line. When point is on a
nonblank line, C-x C-o deletes any blank lines following that
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