fbgrab(1) on Linux
The text 01f612ae977e, as Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.
takes a screenshot using the framebuffer device
Flags it lists
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-? -
-C -
-b -
-c -
-d -
-f -
-h -
-i -
-s -
-w