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Commands are functions that can be invoked interactively either through `M-x` or by a key binding.
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how to get region start and region end from the whole buffer as variables to call another func
(defun buffer-to-shell()
(let (buffer mark-whole-buffer)))
(shell-command-on-region start end "sed s/foo/bar/") ;; start, end not defined
)
As you might see there are undefined variables start …