I'm sorry to disagree, but - no, you can't.

Have you tried? 

$ perl mailbox_parser.pl /home/zwon/Mail/FreeBSD-security | head -n 20
00000 => 0000000000 => FreeBSD Security Advisory FreeBSD-SA-04:03.jail
00001 => 0000007411 => [FreeBSD-Announce] FreeBSD Security Advisory Fr
+eeBSD-SA-04:04.tcp
00002 => 0000015717 => FreeBSD Security Advisory FreeBSD-SA-04:04.tcp
00003 => 0000024280 => [FreeBSD-Announce] FreeBSD Security Advisory Fr
+eeBSD-SA-04:05.openssl
00004 => 0000032992 => FreeBSD Security Advisory FreeBSD-SA-04:05.open
+ssl
00005 => 0000041959 => FreeBSD Security Advisory FreeBSD-SA-04:06.ipv6
00006 => 0000049688 => FreeBSD Security Advisory FreeBSD-SA-04:07.cvs
00007 => 0000058113 => FreeBSD Security Advisory FreeBSD-SA-04:08.heim
+dal
00008 => 0000069503 => FreeBSD Security Advisory FreeBSD-SA-04:09.kadm
+ind
00009 => 0000077885 => FreeBSD Security Advisory FreeBSD-SA-04:10.cvs
00010 => 0000086754 => FreeBSD Security Advisory FreeBSD-SA-04:11.msyn
+c
00011 => 0000094967 => FreeBSD Security Advisory FreeBSD-SA-04:12.jail
+route
00012 => 0000102596 => FreeBSD Security Advisory FreeBSD-SA-04:13.linu
+x
00013 => 0000112415 => FreeBSD Security Advisory FreeBSD-SA-04:14.cvs
00014 => 0000123949 => FreeBSD Security Advisory FreeBSD-SA-04:15.sysc
+ons
00015 => 0000131204 => FreeBSD Security Advisory FreeBSD-SA-04:16.fetc
+h
00016 => 0000141362 => FreeBSD Security Advisory FreeBSD-SA-04:17.proc
+fs
00017 => 0000151053 => FreeBSD Security Advisory FreeBSD-SA-05:01.teln
+et
00018 => 0000160935 => FreeBSD Security Advisory FreeBSD-SA-05:02.send
+file
00019 => 0000170195 => FreeBSD Security Advisory FreeBSD-SA-05:03.amd6
+4

[download]

I just replaced 'mbox' with $ARGV[0] in my example.

PS: note, that cache is not the same as the index

PPS: and you should have Mail::Mbox::MessageParser::Cache installed in order cache to be created, don't know why it is not mentioned in Mail::MboxParser documentation

In reply to Re^5: Mail::MboxParser pegs the CPU by zwon
in thread Mail::MboxParser pegs the CPU by oko1

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