View source for Qpdf

<code>qpdf --empty --pages *.pdf -- out.pdf</code>
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<code>--pages input-file [ page-range ] [ ... ] --</code>
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<p>Multiple input files may be specified. Each one is given as the name of the input file, an optional password (if required
to open the file), and the range of pages. Note that “--” terminates parsing of page selection flags.</p>
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[http://qpdf.sourceforge.net/files/qpdf-manual.html|QPDF Manual]