cvsdo is your friend. it's not perfect, but it should be able to do the following (for a readonly 
repository):

<pre>
J:\2002\_test>echo hi > test

J:\2002\_test>cvsdo add test

J:\2002\_test>cvs diff -uN test
Index: test
===================================================================
RCS file: test
diff -N test
--- /dev/null   1 Jan 1970 00:00:00 -0000
+++ test        5 Nov 2002 17:15:53 -0000
@@ -0,0 +1 @@
+hi

J:\2002\_test>cvsdo diff -uN test
Index: test
--- nul
+++ test
@@ -0,0 +1 @@
+hi

J:\2002\_test>
</pre>

<p>I don't think new directories can be handled in this way. 

<p>Important setup notes:
you need a <a href="cvsdo">cvsdo</a> and a <a href="cvsu">cvsu</a> <ul>
<li> on windows nt i use <a href="cvsdo.pl">cvsdo.pl</a> and <a href="cvsu.pl">cvsu.pl</a> with 
<tt>PATHEXT=%PATHEXT%;.pl</tt> that allows me to type 'cvsdo' without the .pl, and because windows is 
configured to use perl.exe to handle .pl files, things just work

<li> on unix you probably just want to name the files cvsdo and cvsu

<li> the files in this directory are cvsdo.pl/cvsu.pl with symlinks cvsdo/cvsu, you only need one set.

<li> the rest of the files are listed for completeness.
</ul>
<hr>
<a href='.cvsignore'>.cvsignore</a><br> 
<a href='AUTHORS'>AUTHORS</a><br> 
<a href='ChangeLog'>ChangeLog</a><br> 
<a href='FAQ'>FAQ</a><br> 
<a href='Makefile.am'>Makefile.am</a><br> 
<a href='NEWS'>NEWS</a><br> 
<a href='README'>README</a><br> 
<a href='THANKS'>THANKS</a><br> 
<a href='TODO'>TODO</a><br> 
<a href='bootstrap'>bootstrap</a><br> 
<a href='configure.in'>configure.in</a><br> 
<a href='cvschroot.pl'>cvschroot.pl</a><br> 
<a href='cvsco.sh'>cvsco.sh</a><br> 
<a href='cvsdiscard.sh'>cvsdiscard.sh</a><br> 
<a href='cvsdo.pl'>cvsdo.pl</a><br> 
<a href='cvspurge.sh'>cvspurge.sh</a><br> 
<a href='cvsrmadm.sh'>cvsrmadm.sh</a><br> 
<a href='cvstrim.sh'>cvstrim.sh</a><br> 
<a href='cvsu.pl'>cvsu.pl</a><br> 
<a href='cvsutils.1'>cvsutils.1</a><br> 
<a href='cvsutils.spec.in'>cvsutils.spec.in</a><br> 
<hr>
<a href="cvsdiff.cvs">cvsdiff.cvs</a> - diffs between the files here and the redbean cvs