I\'ve a very large subversion repository, it\'s about 7 GB in size and holds many many files and directories from different projects.
Now I did some major change to
The quick and dirty way, if it's just a few changes, is to use svn propget with the --recursive flag to get the properties, and make the changes manually (this might take a while to return):
svn propget --recursive svn:externals http://your.svn.server/ | grep -B 5
To do this in a more automated fashion you can script it:
recursively retrieve svn:externals for every path in the root
check out directories whose externals contain the string you're looking for (you can split the path component by filesystem separator and check out each component with depth=immediate if you want to be really selective about what you check out)
make and commit the change
The advantage doing it this way is that because your checkout effectively mirrors your repository (even though it's missing loads of stuff) you can make a single commit at the top level with all the changes made.
HTH.