Actually you probably could write a postscript virus that deleted/renamed files:
Look at the ghostscript man page for the option '-dSAFER'
"Disables the 'deletefile' and 'renamefile' operators and the ability to open files in any mode other than read-only. This may be desirable for spoolers or other sensitive environments where a badly written or malicious PostScript program must be prevented from changing important files."
Which is why most tools that use ghostscript open PS files with the SAFER flag set.
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Actually you probably could write a postscript virus that deleted/renamed files:
Look at the ghostscript man page for the option '-dSAFER'
"Disables the 'deletefile' and 'renamefile' operators and the ability to open files in any mode other than read-only. This may be desirable for spoolers or other sensitive environments where a badly written or malicious PostScript program must be prevented from changing important files."
Which is why most tools that use ghostscript open PS files with the SAFER flag set.