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(emacs)Hiding Subdirectories

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Hiding Subdirectories
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   "Hiding" a subdirectory means to make it invisible, except for its
header line, via selective display (Note: Selective Display).

`$'
     Hide or reveal the subdirectory that point is in, and move point
     to the next subdirectory (`dired-hide-subdir').  A numeric
     argument serves as a repeat count.

`M-$'
     Hide all subdirectories in this Dired buffer, leaving only their
     header lines (`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.