unique_files.sh

containsElement () {
  local e match="$1"
  shift
  for e; do [[ "$e" == "$match" ]] && return 0; done
  return 1
}

contents=()

OIFS="$IFS"
IFS=$'\n'

for file in `find . -type f`; do 
	content=$(cat "$file"); 
	if ! containsElement $content ${contents[@]};  
		then contents=(${contents[@]} $content); 
	fi;  
done
IFS="$OIFS"

echo "unique files count = ${#contents[*]}";