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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML//EN">
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<HEAD>
<TITLE>MHonArc FAQ: General Usage</TITLE></HEAD>
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<H2><a name="genusage">General Usage</a></H2>
<!-- ??????????????????????????????????????????????????????????????? -->
<h3><img src="monicon.gif" align="bottom" alt=""> <b><a name="resources">What are "resources"?</a></b></h3>
<p>The behavior of MHonArc is controled by <em>resources</em>.
Resources are set, or defined, by command-line options, environment
variables, or a resource file. For example, the MAXSIZE resource tells
MHonArc the maximum number of messages in an archive. To set
the resource, you can use the <strong><code>-maxsize</code></strong>
command-line option, the <strong>M2H_MAXSIZE</strong> envariable, or the
<strong><code><MAXSIZE></code></strong> resource file element.
</p>
<p>See the documentation for more information.
</p>
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<h3><img src="monicon.gif" align="bottom" alt=""> <b><a name="newgetopt">I get an error that "newgetopt.pl" cannot be required, where is it?</a></b></h3>
<p>newgetopt.pl comes with the standard Perl distribution. Check with
your sys admin on where it is located (it should be in the default Perl
search path).
</p>
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<h3><img src="monicon.gif" align="bottom" alt=""> <b><a name="searching">Does MHonArc provide searching of archives?</a></b></h3>
<p>No, but a searching can be provided by another utility. See
the MHonArc home page
(<a href="http://www.oac.uci.edu/indiv/ehood/mhonarc.html"
>http://www.oac.uci.edu/indiv/ehood/mhonarc.html</a>) to
some links to contributed programs for searching MHonArc
archives.
Also, any standard search engine can be used. For example, the
MHonArc mailing list archive
(<A HREF="http://www.rosat.mpe-garching.mpg.de/mailing-lists/mhonarc/"
>http://www.rosat.mpe-garching.mpg.de/mailing-lists/mhonarc/</a>)
provides a
<strong>Glimpse</strong>
(<a href="http://glimpse.cs.arizona.edu:1994/"
>http://glimpse.cs.arizona.edu:1994/</a>)
search engine for searching messages. For more information, see
the respective documentation of the search engine software of
interest.
</p>
<dl>
<dt><strong>NOTE</strong></dt>
<dd><p>Through MHonArc's resources, it is easy to provide
a search form to whatever search utility you may use without
modifying MHonArc source code.
</p>
</dd>
</dl>
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<h3><img src="monicon.gif" align="bottom" alt=""> <b><a name="webui">Is there a Web interface for MHonArc?</a></b></h3>
<p>There is no known Web interface that uses MHonArc to
allow people to read incoming mail or perform archive administration
function. If you know of one, please contact the author of the FAQ.
</p>
<!-- ??????????????????????????????????????????????????????????????? -->
<h3><img src="monicon.gif" align="bottom" alt=""> <b><a name="orgmsg">Does MHonArc require that the original message be available when updating an archive?</a></b></h3>
<p>No. Once a message is archived, the original can be stored
away. MHonArc preserves all relevant information in its
database. For possible recovering purposes, it is recommended
to preserve original messages in a storage archive. This allows
you to rebuild MHonArc archives in case of data corruption.
</p>
<!-- ??????????????????????????????????????????????????????????????? -->
<h3><img src="monicon.gif" align="bottom" alt=""> <b><a name="respecify">Do I have to respecify the resource file each time I update an archive?</a></b></h3>
<P>No. The archive database stores all resource settings. The only
time you need to respecify the resource file is if changes are required
in the layout of the archive. </P>
<DL>
<DT><STRONG>NOTE</STRONG>
<DD><P>When utilizing the <strong>OTHERINDEXES</strong> resource,
the resource filenames listed in the main resource file are stored
in the database, but the resources for each additional index are
<STRONG>NOT</STRONG>. Hence, the resource files defining the additional
indexes must be accesible.
</P></DL>
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<h3><img src="monicon.gif" align="bottom" alt=""> <b><a name="sepfiles">Can I have MHonArc process a bunch of separate message files?</a></b></h3>
<p>Yes. MH mail folder processing is just processing a bunch of
separate message files in a directory. MHonArc uses
the MHPATTERN resource to determine which files to process. Therefore,
all you need to do is redefine the MHPATTERN resource and pass
the directory your message files are in when invoking MHonArc.
</p>
<p>For example, say I want to process all files in a directory
called "messages". I'd do the following:
</p>
<pre>
% <b>mhonarc -mhpattern "^[^.]" messages</b>
</pre>
<p>MHPATTERN can be any Perl regular expression. The one in
the example matches any file not beginning with ".". This
is to avoid the special files "." and ".." which are directories.
</p>
<p>The other way to process individual message files is to do
it one at a time. For example:
</p>
<pre>
% <b>mhonarc -add < file1.822</b>
% <b>mhonarc -add < file2.822</b>
...
</pre>
<!-- ??????????????????????????????????????????????????????????????? -->
<h3><img src="monicon.gif" align="bottom" alt=""> <b><a name="stdin">Can I tell MHonArc to read a mailbox from standard input?</a></b></h3>
<p>Yes, but only in v2.0 or later (v2.0 beta releases do not have
the capability). The syntax is something like the following:
</p>
<pre>
% <b>mhonarc </b><var>[options-here]</var> <b>-- -</b>
</pre>
<p>The "--" tells MHonArc to terminate all command-line
option processing and treat all following arguments as mail
folders. The "-" signifies to use standard input as a mailbox
source.
</p>
<p>Since MHonArc can read a mailbox from stdin, this
allows MHonArc to be part of a pipeline where MHonArc
takes input from some preprocessor that massages some data to
make it suitable for processing by MHonArc. For example:
</p>
<pre>
% <b>mypreproc | mhonarc -- -</b>
</pre>
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<address>
97/05/15 16:48:11<br>
<img align="top" src="monicon.gif" alt="">
<a href="http://www.oac.uci.edu/indiv/ehood/mhonarc.html"
><strong>MHonArc</strong></a><br>
Copyright © 1997, <a href="http://www.oac.uci.edu/indiv/ehood/"
>Earl Hood</a>, <a href="mailto:ehood@medusa.acs.uci.edu"
>ehood@medusa.acs.uci.edu</a><br>
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