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u -- Undo command.
default range syntax
. u[d]
1. "u" is used to undo modifications to a line immediately
after changes are made. E.g. if you substituted "pat" for
"hat" in a line, to reverse that operation immediately, simply
type "u" (RETURN).
2. "ud" is used to restore a group of lines that have been
delete E.g. if "n,md" deletes lines n thru m, then if you
position the curser to line n-1 and issue "ud" the deleted
lines will appear. (Or you can set the od toggle to od< so
that the line pointer is automatically set to n-1.
To return to the command directory, type "hcomdir."
See also: "hd" and "hod".