-p does not always pause after every screen of info
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glennrp
-p switch without other parameters does not pause exactly after 1 screenful of text is displayed, even when screen height is set to 25. In particular, when run pngcrush without switch, it shows more than 50 lines of text before pausing, and shows different number of lines before subsequent pauses. It should pause based on current screen height.
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You can pipe the output of pngcrush through "more" or "less" to get more or less what
you want.