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Minor modes are options which you can use or not. For example, Auto
Fill mode is a minor mode in which SPC breaks lines between words as
you type. All the minor modes are independent of each other and of the
selected major mode. Most minor modes inform you in the mode line when
they are on; for example, `Fill' in the mode line means that Auto Fill
mode is on.
Append `-mode' to the name of a minor mode to get the name of a
command function that turns the mode on or off. Thus, the command to
enable or disable Auto Fill mode is called `M-x auto-fill-mode'. These
commands are usually invoked with `M-x', but you can bind keys to them
if you wish. With no argument, the function turns the mode on if it was
off and off if it was on. This is known as "toggling". A positive
argument always turns the mode on, and an explicit zero argument or a
negative argument always turns it off.
Auto Fill mode allows you to enter filled text without breaking lines
explicitly. Emacs inserts newlines as necessary to prevent lines from
becoming too long. Note: Filling.
Overwrite mode causes ordinary printing characters to replace
existing text instead of moving it to the right. For example, if point
is in front of the `B' in `FOOBAR', and you type a `G' in Overwrite
mode, it changes to `FOOGAR', instead of `FOOGBAR'.
Abbrev mode allows you to define abbreviations that automatically
expand as you type them. For example, `amd' might expand to `abbrev
mode'. Note: Abbrevs, for full information.
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