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A Dired buffer usually displays just one directory, but you can optionally include its subdirectories as well.
The simplest way to include multiple directories in one Dired buffer is to specify the options ‘-lR’ for running ls. (If you give a numeric argument when you run Dired, then you can specify these options in the minibuffer.) That produces a recursive directory listing showing all subdirectories at all levels.
More often, you will want to show only specific subdirectories. You
can do this with i (
If you use this command on a line that describes a file which is a directory, it inserts the contents of that directory into the same Dired buffer, and moves there. Inserted subdirectory contents follow the top-level directory of the Dired buffer, just as they do in ‘ls -lR’ output.
If the subdirectory's contents are already present in the buffer, the i command just moves to it.
In either case, i sets the Emacs mark before moving, so C-u C-<SPC> returns to your previous position in the Dired buffer (see Setting Mark). You can also use ‘^’ to return to the parent directory in the same Dired buffer (see Dired Visiting).
Use the l command (
dired-do-redisplay) to update the
subdirectory's contents, and use C-u k on the subdirectory
header line to remove the subdirectory listing (see Dired Updating). You can also hide and show inserted subdirectories
(see Hiding Subdirectories).