hydrostat - Man Page

Wiggly squid or jellyfish with many tentacles.


hydrostat [-display host:display.screen] [-visual visual] [-window] [-root] [-delay number] [-speed number] [-count number] [-head-radius number] [-tentacles number] [-thickness number] [-length number] [-gravity number] [-current number] [-friction number] [-no-pulse] [-wireframe] [-fps]


Wiggly squid or jellyfish with many tentacles.  A muscular hydrostat is a biological structure used to move its host about, consisting of muscles with no skeletal support. It performs its hydraulic movement without fluid in a separate compartment, as in a hydrostatic skeleton.


-visual visual

Specify which visual to use.  Legal values are the name of a visual class, or the id number (decimal or hex) of a specific visual.


Draw on a newly-created window.  This is the default.


Draw on the root window.

-delay number

Per-frame delay, in microseconds.  Default: 20000 (0.02 seconds).

-speed number

Animation speed.  2.0 means twice as fast, 0.5 means half as fast.

-count number

Number of squid.  1 - 100.  Default: 10.

-head-radius number

Head size.  10 - 100.  Default: 60.

-tentacles number

Number of tentacles.  3 - 100.  Default: 40.

-thickness number

Thickness of tentacles.  3 - 40.  Default: 18.

-length number

Length of tentacles.  10 - 150.  Default: 70.

-gravity number

Strength of gravity.  0 - 10.0.  Default: 0.5.

-current number

Strength of current.  0.0 - 10.0.  Default: 0.25.

-friction number

Coefficient of friction.  0.0 - 0.1.  Default: 0.02.

-pulse | -no-pulse

Whether the squid should pulse. Default true.

-wireframe | -no-wireframe

Render in wireframe instead of solid.

-fps | -no-fps

Whether to show a frames-per-second display at the bottom of the screen.



to get the default host and display number.


to get the name of a resource file that overrides the global resources stored in the RESOURCE_MANAGER property.

See Also

X(1), xscreensaver(1)


Justin Windle and Jamie Zawinski.


6.04-1.fc37.1 (23-Jul-2022) X Version 11 XScreenSaver manual