optipng(1) on Linux
The text 49bacef31cc0, as Debian 5.0 (Lenny) shipped it.
Advanced optimization program for Portable Network Graphics (PNG)
Flags it lists
-
-- -
-? -
-dir -
-f -
-fix -
-force -
-full -
-h -
-help -
-i -
-k -
-keep -
-log -
-nb -
-nc -
-np -
-nz -
-o -
-out -
-preserve -
-q -
-quiet -
-simulate -
-snip -
-v -
-zc -
-zm -
-zs