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Hiding a subdirectory means to make it invisible, except for its header line, via selective display (see section J.9 Selective Display).
dired-hide-subdir). A numeric argument serves as a repeat count.
dired-hide-all). Or, if any subdirectory is currently hidden, make all subdirectories visible again. You can use this command to get an overview in very deep directory trees or to move quickly to subdirectories far away.
Ordinary Dired commands never consider files inside a hidden subdirectory. For example, the commands to operate on marked files ignore files in hidden directories even if they are marked. Thus you can use hiding to temporarily exclude subdirectories from operations without having to remove the markers.
The subdirectory hiding commands toggle; that is, they hide what was visible, and show what was hidden.