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(efaq)Repeating commands

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Is there an equivalent to the `.' (dot) command of vi?
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   (`.' is the redo command in `vi'.  It redoes the last
insertion/deletion.)

   As of Emacs 20.3, there is indeed a `repeat' command (`C-x z') that
repeats the last command.  If you preface it with a prefix argument,
the prefix arg is applied to the command.

   You can also type `C-x <ESC> <ESC>' (`repeat-complex-command') to
reinvoke commands that used the minibuffer to get arguments.  In
`repeat-complex-command' you can type `M-p' and `M-n' (and also
up-arrow and down-arrow, if your keyboard has these keys) to scan
through all the different complex commands you've typed.

   To repeat a set of commands, use keyboard macros.  (Note: Keyboard
Macros.)

   If you're really desperate for the `.' command, use VIPER, a `vi'
emulation mode which comes with Emacs, and which appears to support it.
(Note: VIPER.)