In postscript, how do I obtain the UnderlinePosition, which is an integer, from the currently active font?

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I've tried executing the following:

0 UnderlinePosition rmoveto

This doesn't work, because UnderlinePosition is a key in the font dictionary, rather than a variable that I can access directly. I'm just trying to figure out how to obtain this value from the font dictionary.

postscript
1 Answers

The /FontInfo is a dictionary inside each font containing the /UnderlinePosition key:

0
currentfont
/FontInfo get /UnderlinePostition get
rmoveto
user_105816540
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