Say you've got a Subversion source code tree checked out, and for whatever reason you want to remove all Subversion directories inside that tree. (The thing that makes a Subversion tree a Subversion tree is the presence of a ".svn" folder in every folder of the tree. If you had a complicated source tree with lots of subdirectories, it would take you forever to remove each one.) You can remove all ".svn" directories starting below "\~/svn/exampleproject" -- change this to suit your system -- with the following command:
find ~/svn/exampleproject -name ".svn" -exec rm -rf {} ;
To make sure that the above command is going to do what you want it to do, you may want to first generate a list of what it will delete (I highly recommend it).
find ~/svn/exampleproject -name ".svn" -exec echo "rm -rf {}" ;