pngcheck(1) on Linux
The text 5aa1b56da395, as Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
Test PNG image files for corruption, and print size/type/compression info.
Flags it lists
-
-7 -
-f -
-p -
-q -
-s -
-t -
-v -
-x