Bash function to generate a UUID v3

# http://en.wikipedia.org/wiki/Universally_unique_identifier#Version_3_.28MD5_hash.29
getUUID (){
  a='89ab'
  b=${a:$(($RANDOM%4)):1}
  date +%s%N|md5sum -|sed -r "s/^(.{8})(.{4})(.)(.{3})(.)(.{3})(.{12})(.*$)/\1-\2-y\4-$b\6-\7/"
}