(a2ps.info)Caution when Using card

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9.1.2 Caution when Using 'card'
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Remember that 'card' runs the programs you give it, and the commands you
supplied.  Hence if there is a silly programs that has a weird behavior
given the option '-h' etc., beware of the result.

   It is even clearer using '--command': avoid running 'card
--command="rm -rf *"', because the result will be exactly what you think
it will be!