Ceiling_CrushRaiseAndStaySilA

From ZDoom Wiki

255:Ceiling_CrushRaiseAndStaySilA (tag, dspeed, uspeed, crush [, crushmode])

tag: Tag of affected sector 
dspeed: How quickly the ceiling moves down 
uspeed: How quickly the ceiling moves back up 
crush: Amount of damage to apply 
crushmode: Sets the crushing mode (development version only)

Usage

Lowers the ceiling of the tagged sector(s) and applies crushing damage to anything underneath it, then raises the ceiling back up to its original height. If tag is 0, then the sector on the line's back side is used. Crushers started with this special will only make noise at the top and bottom of their strokes.

Examples

As the ceiling specials are fairly trivial, examples of every one can be found in the example wad, Squash. This wad runs on Map01 of Doom2.