Can I open and then export a file from the command line?

"Linick, James (SED/WESTAR)" <[email protected]> Thu, 14 Sep 2006 10:12:59 -0500

Newsgroups	gmane.network.ethereal.user
Message-ID	<3416952878223F4BA8D143D53A7D6BF102F2C28F@ba-exch2.ds.amrdec.army.mil>

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Is it possible to open a tcpdump file and export it to a PDML file from
the command line?