-s (silent) is also undocumented. There's a confusing distinction
between it and -q (quiet), where the latter isn't quiet in the usual
sense; -s is needed to silence non-error output entirely. There's
useless output even when called entirely without options:
$ pngcrush
CPU time decode 0.000000, encode 0.000000, other 0.000000, total 0.000002
sec
$ pngcrush -q
CPU time decode 0.000000, encode 0.000000, other 0.000000, total 0.000002
sec
$ pngcrush -s
$
This is pngcrush 1.8.13-0.1 on focal.
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https://bugs.launchpad.net/bugs/1593645
Title:
manpage does not document "-reduce" parameter
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