The other special commands of outline mode are used to make lines visible or invisible. Their names all start with hide or show . Most of them fall into pairs of opposites. They are not undoable; instead, you can undo right past them. Making lines visible or invisible is simply not recorded by the undo mechanism.
hide-body ). show-all ). hide-subtree ). show-subtree ). hide-leaves ). show-branches ). show-children ). hide-entry ). show-entry ). hide-sublevels ). hide-other ).
Two commands that are exact opposites are C-c C-c (hide-entry ) and C-c C-e (show-entry ). They are used with point on a heading line, and apply only to the body lines of that heading. Subheadings and their bodies are not affected.
Two more powerful opposites are C-c C-d (hide-subtree ) and C-c C-s (show-subtree ). Both expect to be used when point is on a heading line, and both apply to all the lines of that heading's subtree: its body, all its subheadings, both direct and indirect, and all of their bodies. In other words, the subtree contains everything following this heading line, up to and not including the next heading of the same or higher rank.
Intermediate between a visible subtree and an invisible one is having all the subheadings visible but none of the body. There are two commands for doing this, depending on whether you want to hide the bodies or make the subheadings visible. They are C-c C-l (hide-leaves ) and C-c C-k (show-branches ).
A little weaker than show-branches is C-c C-i (show-children ). It makes just the direct subheadings visible---those one level down. Deeper subheadings remain invisible, if they were invisible.
Two commands have a blanket effect on the whole file. C-c C-t (hide-body ) makes all body lines invisible, so that you see just the outline structure. C-c C-a (show-all ) makes all lines visible. These commands can be thought of as a pair of opposites even though C-c C-a applies to more than just body lines.
The command C-c C-q (hide-sublevels ) hides all but the top level headings. With a numeric argument n, it hides everything except the top n levels of heading lines.
The command C-c C-o (hide-other ) hides everything except the heading or body text that point is in, plus its parents (the headers leading up from there to top level in the outline).
You can turn off the use of ellipses at the ends of visible lines by setting selective-display-ellipses to nil . Then there is no visible indication of the presence of invisible lines.