10.3 Saving Rectangles in Registers
A register can contain a rectangle instead of lines of text. The
rectangle is represented as a list of strings. Note: Rectangles, for
basic information on rectangles and how to specify rectangles in a
`C-x r r R'
Copy the region-rectangle into register R
(`copy-rectangle-to-register'). With a numeric argument, delete it
`C-x r g R'
`C-x r i R'
Insert the rectangle stored in register R (if it contains a
The `C-x r i R' command inserts linear text if the register
contains that, or inserts a rectangle if the register contains one.
See also the command `sort-columns', which you can think of as
sorting a rectangle. Note: Sorting.
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