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(emacs)Fixit

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Commands for Fixing Typos
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   In this chapter we describe the commands that are especially useful
for the times when you catch a mistake in your text just after you have
made it, or change your mind while composing text on the fly.

   The most fundamental command for correcting erroneous editing is the
undo command, `C-x u' or `C-_'.  This command undoes a single command
(usually), a part of a command (in the case of `query-replace'), or
several consecutive self-inserting characters.  Consecutive repetitions
of `C-_' or `C-x u' undo earlier and earlier changes, back to the limit
of the undo information available.  Note: Undo, for more information.

Kill Errors

Commands to kill a batch of recently entered text.

Transpose

Exchanging two characters, words, lines, lists...

Fixing Case

Correcting case of last word entered.

Spelling

Apply spelling checker to a word, or a whole file.