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<TITLE>The Answer Guy 42: MATCH and Replaceable Parameters in procmail</TITLE>
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<H4>"The Linux Gazette...<I>making Linux just a little more fun!</I>"</H4>
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<H1><A NAME="answer">
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<font color="#B03060">The Answer Guy</font>
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<H4>By James T. Dennis,
<a href="mailto:linux-questions-only@ssc.com">linux-questions-only@ssc.com</a><BR>
LinuxCare,
<A HREF="http://www.linuxcare.com/">http://www.linuxcare.com/</A>
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
height="50" width="60" alt="(?) " border="0"
>MATCH and Replaceable Parameters in procmail</H3>
<p><strong>From Nick Moffitt on Sat, 01 May 1999
</strong></p>
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MATCH and Replaceable Parameters in procmail
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<P><STRONG><IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
So, here's one for the answer guy.
</STRONG></P>
<P><STRONG>
I have a mhonarc user that creates drop points for a mhonarc script to
walk by every night and process. Thing is, I don't want to have to
edit the mhonarc user's <tt>.procmailrc</tt> every single time. That is,
let's say that I have the following:
</STRONG></P>
<Pre><STRONG>
:0:
* ^Sender: owner-potato-peelers
spool/potato-peelers
:0:
* ^Sender: owner-onion-skinners
spool/onion-skinners
</STRONG></Pre>
<P><STRONG>
Is there some way that I can automate this format? e.g.:
</STRONG></P>
<Pre><STRONG>
:0:
* ^Sender: owner-\([^@]+\)
spool/$1
</STRONG></Pre>
<P><STRONG>
This likely breaks procmail's own regex syntax, but you get the point.
"Anything that has an owner-foo Sender header should go to spool/foo."
</STRONG></P>
<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Nick,
</BLOCKQUOTE>
<BLOCKQUOTE>
You have the right idea but, as you've guessed, the
wrong syntax. The answer is to use the <tt>MATCH</tt> variable
and the <tt>\/</tt> (fencepost) operator as described in this
excerpt from the <tt>procmailrc</tt>(5) man page:
</BLOCKQUOTE>
<blockquote><pre> MATCH This variable is assigned to by procmail when-
ever it is told to extract text from a match-
ing regular expression. It will contain all
text matching the regular expression past the
`\/' token.
</pre></blockquote>
<BLOCKQUOTE>
So, your recipe would look something like:
</BLOCKQUOTE>
<blockquote><pre>:0:
* ^Sender: owner-\/.*
spool/$MATCH
</pre></blockquote>
<BLOCKQUOTE>
(though I haven't tested this specifically).
</BLOCKQUOTE>
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
height="50" width="60" alt="(?) " border="0"
>procmail and saved variables.</H3>
<p><strong>From Nick Moffitt on Sun, 2 May 1999
</strong></p>
<font color="#000066"><em>
<P><STRONG>
[Jim Dennis said]
So, your recipe would look something like:
</STRONG></P>
<P><STRONG><BlockQuote><Code>
<Br>:0:
<Br>* ^Sender: owner-\/.*
<Br>spool/$MATCH
</Code></BlockQuote></STRONG></P>
<P><STRONG>
(though I haven't tested this specifically).
</STRONG></P>
</em></font>
<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
I have! It works like a charm.
</BLOCKQUOTE>
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<P> <hr> <P>
<H5 align="center"><a href="http://www.linuxgazette.com/copying.html"
>Copyright &copy;</a> 1999, James T. Dennis
<BR>Published in <I>The Linux Gazette</I> Issue 42 June 1999</H5>
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