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    copied!<p>I use <a href="http://www.procmail.org/" rel="nofollow noreferrer">procmail</a> to sort my incoming email to different folders. Because I have trouble remembering the procmailrc syntax, I use <a href="http://www.gnu.org/software/m4/" rel="nofollow noreferrer">m4</a> as a preprocessor. Here's how my procmailrc begins (this isn't the script yet):</p> <pre><code>divert(-1) changequote(&lt;&lt;, &gt;&gt;) define(mailinglistrule, &lt;&lt;:0: * $2 Lists/$1 &gt;&gt;) define(listdt, &lt;&lt;mailinglistrule($1,^Delivered-To:.*$2)&gt;&gt;) define(listid, &lt;&lt;mailinglistrule($1,^List-Id:.*&lt;$2&gt;)&gt;&gt;) divert# Generated from .procmailrc.m4 -- DO NOT EDIT </code></pre> <p>This defines two macros for mailing lists, so e.g. listdt(foo, foo@example.com) expands to</p> <pre><code>:0: * ^Delivered-To:.*foo@example.com Lists/foo </code></pre> <p>meaning that emails with a Delivered-To header containing foo@example.com should be put in the Lists/foo folder. It also arranges the processed file to begin with a comment that warns me not to edit that file directly.</p> <p>Now, frankly, m4 scares me: what if I accidentally redefine a macro and procmail starts discarding all my email, or something like that? That's why I have a script, which I call update-procmailrc, that shows me in diff format how my procmailrc is going to change. If the change is just a few lines and looks roughly like what I intended, I can happily approve it, but if there are huge changes to the file, I know to look at my edits more carefully.</p> <pre><code>#! /bin/sh PROCMAILRC=.procmailrc TMPNAM=.procmailrc.tmp.$$ cd $HOME umask 077 trap "rm -f $TMPNAM" 0 m4 &lt; .procmailrc.m4 &gt; $TMPNAM diff -u $PROCMAILRC $TMPNAM echo -n 'Is this acceptable? (y/N) ' read accept if [ -z "$accept" ]; then accept=n fi if [ $accept = 'y' -o $accept = 'Y' ]; then mv -f $TMPNAM $PROCMAILRC &amp;&amp; \ chmod 400 $PROCMAILRC &amp;&amp; \ echo "Created new $PROCMAILRC" if [ "$?" -ne 0 ]; then echo "*** FAILED creating $PROCMAILRC" fi else echo "Didn't update $PROCMAILRC" fi </code></pre> <p>The script hasn't yet prevented any email disasters, but it has made me less anxious about changing my procmailrc.</p>
 

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