Newbie query: working on already delivered messages - batch mode?

[D Ruggiero]

So, Bogofilter's happily installed on my ancient RH 7.1 mail server (don't 
ask) and is so much easier, more efficient, and accurate to the client-side 
filter I had been using that it's laughable. So far, so good - thanks for 
the great work.

However: due to my bizarro setup here, I'm only able to filter messages 
after they're already delivered (ie, in my maildir as separate files, one 
per message). Again, don't ask. :)  What I really want to do is simply have 
Bogofilter look at each message and insert its X-Bogosity header "in-situ", 
without otherwise changing the message or its filename. Right now I'm doing 
this with a bash script:

#!/bin/bash
cd [my maildir]
find . -type f -newer bogotime > /tmp/bogofiles
touch bogotime

xargs -i -r bash -c "/bin/mv {} bogotmp; bogofilter -peI bogotmp -O {}" \; < 
/tmp/bogofiles

rm -f bogotmp /tmp/bogofiles
exit 0


Two problems with this: first, it seems like an ugly kluge, and second, it 
requires a file move and a separate invocation of bogofilter for every 
message. Surely there must be a better way? Is there method to get 
Bogofilter to operate on all the found "new" messages all at once, adding 
its header to each, and keeping them in the same file names, all in one fell 
swoop?

(I have a feeling that "batch" mode is what I want, but I'm not sure how to 
make that work on separate messages rather than one big input stream. I'm 
also very hazy on the difference between "-b" and "-B"....)

Any advice or insight is appreciated.

-David