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### 3.1 Omitting Variables

The following variables can be used to customize omitting.

`dired-omit-mode`
  Default: `nil`

  If non-`nil`, “uninteresting” files are not listed. Uninteresting files are those whose files whose names match regexp `dired-omit-files`, plus those ending with extensions in `dired-omit-extensions`. `M-o` (`dired-omit-mode`) toggles its value, which is buffer-local. Put

                (dired-omit-mode 1)

  inside your `dired-mode-hook` to have omitting initially turned on in every Dired buffer (see Installation). You can then use `M-o` to unomit in that buffer.

  To enable omitting automatically only in certain directories one can use Dired Local Variables and put

                Local Variables:
                dired-omit-mode: t
                End:

  into a file `.dired` (the default value of `dired-local-variables-file`) in that directory (see Local Variables).

  `dired-omit-here-always`
    This is an interactive function that creates a local variables file exactly like the example above (if it does not already exist) in the file `dired-local-variables-file` in the current directory and then refreshes the directory listing (see Local Variables).

`dired-omit-files`
  Default: `"^#\\|\\.$"`

  Files whose names match this buffer-local regexp will not be displayed. This only has effect when `dired-omit-mode`'s value is `t`.

  The default value omits the special directories `.` and `..` and autosave files (plus other files ending in `.`) (see Omitting Examples).

`dired-omit-extensions`
  Default: The elements of `completion-ignored-extensions`, `dired-latex-unclean-extensions`, `dired-bibtex-unclean-extensions` and `dired-texinfo-unclean-extensions`.

  If non-`nil`, a list of extensions (strings) to omit from Dired listings. Its format is the same as that of `completion-ignored-extensions`.

`dired-omit-localp`
  Default: `no-dir`

  The localp argument `dired-omit-expunge` passes to `dired-get-filename`. If it is `no-dir`, omitting is much faster, but you can only match against the non-directory part of the file name. Set it to `nil` if you need to match the whole file name or `t` to match the file name relative to the buffer's top-level directory.

`dired-omit-marker-char`
  Default: `C-o`

  Temporary marker used by Dired to implement omitting. Should never be used as marker by the user or other packages. There is one exception to this rule: by adding

                (setq dired-mark-keys "\C-o")
                ;; i.e., the value of dired-omit-marker-char
                ;; (which is not defined yet)

  to your `~/.emacs`, you can bind the `C-o` key to insert a `C-o` marker, thus causing these files to be omitted in addition to the usually omitted files. Unfortunately the files you omitted manually this way will show up again after reverting the buffer, unlike the others.