Empty directories in version control stink. Most probably they shouldn't be there. Such directories have a single subdirectory in them named ".svn", and no other files or subdirectories.

• The "find" searches for files files named .svn that are directories
• The "while" assigns each line in the input to the variable ss
• The "dirname" gets the parent directory of a path, the quotes are necessary for paths with spaces
• ls -a should output 3 lines if the directory is in fact empty: ".", "..", and ".svn"
• If the test is true and there are precisely 3 files in the directory, echo what we want to do
• If the output of the one-liner looks good, pipe it to | sh to really execute