RE: Indent region by one tabstop

[Drew Adams]

> > Use `indent-rigidly' with the value of `tab-width'?
> >
> > (defun my-indent-a-tab-width (start end)
> >   (interactive "r")
> >   (indent-rigidly start end tab-width))
> 
> Works great, thanks!  You wouldn't happen to know a way to do 
> the inverse,
> delete 4 spaces from the beginning of each line in a region?

Same function, `indent-rigidly', but with a negative argument.

C-h f indent-rigidly