# Explanation of parameters
# .              start searching in current directory
# -name '.svn'   find files and folders named exactly .svn
# -exec          run a command on each file
# rm -rf {}      the command is 'rm -rf' (braces substituted for each found filename)
# \;             escape (\) the semicolon (;) so that bash ignores it and passes it to find
find . -name '.svn' -exec rm -rf {} \;