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hydrostat - Man Page

Wiggly squid or jellyfish with many tentacles.


hydrostat [--display host:display.screen] [--visual visual] [--window] [--root] [--window-id number] [--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.

--window-id number

Draw on the specified 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.


The window ID to use with --root.

See Also

X(1), xscreensaver(1)


Justin Windle and Jamie Zawinski.


6.09-1.fc41 (11-Jun-2024) X Version 11 XScreenSaver manual