The well known way is svn export. Some times this command is not applicable. You can use this simple shell command in this case (Linux/*nix only).
find destination/directory_name/ -name .svn -type d | xargs -n 1 rm -rf
You need to change destination/directory_name/ to your real path, what you want clean.
Or here is a simple bash script. Use this for
if [ -z $1 ]
echo "Usage: $0 <directory_path>"
echo "Where <directory_path> is the path what you want clean."
find $1 -name .svn -type d | xargs -n 1 rm -rf
Copy and paste this script to a file at your /usr/local/bin/. (For example: svn-cleaner.sh)
You make it executable: chmod +x /usr/local/bin/svn-cleaner.sh
Now you can run svn cleaner script as svn-cleaner.sh
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