Viper Is a Package for Emacs Rebels
2.2 Undo and Backups
Viper provides multiple undo. The number of undo's and the size is limited
by the machine. The Viper command u does an undo. Undo can be
repeated by typing . (a period). Another u will undo the undo,
and further
. will repeat it. Typing u does the first undo, and changes the
direction.
Since the undo size is limited, Viper can create backup files and
auto-save files. It will normally do this automatically. It is possible
to have numbered backups, etc. For details, see section `Backup and Auto-Save' in The GNU Emacs Manual
The results of the 9 previous changes are available in the 9 numeric
registers, as in Vi. The extra goody is the ability to view these
registers, in addition to being able to access them through p and
M-y (See section 1.3.3 Insert State, for details.)
The Viper command ] register will display the contents of any
register, numeric or alphabetical. The related command [ textmarker
will show the text around the textmarker. `register' and `textmarker'
can be any letters from a through z.
