On Aug 19, 2010, at 10:49, David Aldrich wrote:

> I have now read the cherrypicking section. I think the point to note is that 
> merge is to do with changes, e.g. merge in the changes made in r1823.  I was 
> looking to bring a specific version of a file. So, with merge, I would need 
> to work out which range of changes to apply.

You can do that. To replace myfile.txt in the tag mytag with the older revision 
123, you could do:

svn rm $URL/tag/mytag/myfile.txt
svn cp $URL/trunk/myfile....@123 $URL/tag/mytag

Or instead of using URLs you could work in a working copy of the tag, then 
commit the tag; this is probably better so you can test your changes in the tag 
first before committing everything:

svn co $URL/tag/mytag
cd mytag
svn rm myfile.txt
svn cp $URL/trunk/myfile....@123 .
svn ci


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