diff --git a/README.md b/README.md
index 80f4064..d6aaabb 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,7 @@ findall [:<character1> [:...]] <query> [-e<filename>|--export=<filename>]
 * `character1`: the name of the characters to use for the search.
 * `...`: variable list of character names.
 * `query` the word you are looking for.
+* `-d` or `--duplicates` to list only items which are found in more than one container
 * `-e<filename>` or `--export=<filename>` exports the results to a csv file. The file will be created in the data folder.
 
 Looks for any item whose name (long or short) contains the specified value on the specified characters.
diff --git a/findall.lua b/findall.lua
index f2942d8..4cb05c3 100644
--- a/findall.lua
+++ b/findall.lua
@@ -79,6 +79,7 @@ function error(method, message)
     print('ERR(' .. method .. '): ' .. message)
 end
 
+
 function encase_key(key)
     if type(key) == 'number' then
         return '[' .. tostring(key) .. ']'
@@ -258,6 +259,7 @@ function print_help()
         { '    [:<character1> [:...]]',             '- the names of the characters to use for the search.' },
         { '    [!<character1> [!...]]',             '- the names of the characters to exclude from the search.' },
         { '    [<query>]',                          '- the word you are looking for.' },
+        { '    [-d|--duplicates]',                  '- list only items which are found in more than one container.' },
         { '    [-e<filename>|--export=<filename>]', '- exports the results to a csv file in the data folder.' },
     }
     local examples = {
@@ -312,6 +314,7 @@ function determine_query_elements(searchparams)
     local char_exclude = {}
     local search_terms = {}
     local export = nil
+    local duplicates = false
 
     for _, query_element in pairs(searchparams) do
         -- character specifiers must start with a '!' or a ':'
@@ -336,12 +339,14 @@ function determine_query_elements(searchparams)
                     error('determine_query_elements', 'The filename cannot contain any of the following characters: \\ / : * ? " < > |')
                 end
             end
+        elseif string.match(query_element, '^--duplicates$') or string.match(query_element, '^-d$') then
+            duplicates = true
         else
             table.insert(search_terms, query_element)
         end
     end
 
-    return char_include, char_exclude, table.concat(search_terms,' '), export
+    return char_include, char_exclude, table.concat(search_terms,' '), export, duplicates
 end
 
 
@@ -389,7 +394,34 @@ function search(char_include, char_exclude, terms)
 end
 
 
-function display_search_results(result, from_all_chars, terms)
+function filter_duplicates(search_result)
+    for char_name, storage_list in pairs(search_result) do
+        storage_list[KEY_ITEM_STORAGE_NAME] = nil
+    end
+
+    local counts_by_itemid = {}
+    for char_name, storage_list in pairs(search_result) do
+        for storage_name, item_list in pairs(storage_list) do
+            for item_id, quantity in pairs(item_list) do
+                counts_by_itemid[item_id] = (counts_by_itemid[item_id] or 0) + 1
+            end
+        end
+    end
+
+    for char_name, storage_list in pairs(search_result) do
+        for storage_name, item_list in pairs(storage_list) do
+            for item_id, quantity in pairs(item_list) do
+                if counts_by_itemid[item_id] == 1 then
+                    item_list[item_id] = nil
+                end
+            end
+        end
+    end
+    return search_result
+end
+
+
+function display_search_results(result, from_all_chars, terms, duplicates)
     local terms_pattern = build_search_pattern(terms)
 
     local total_quantity = 0
@@ -403,7 +435,7 @@ function display_search_results(result, from_all_chars, terms)
                     total_quantity = total_quantity + quantity
                 end
 
-                local prefix = '\30\03' .. char_name .. '/' .. storage_name .. ':\30\01 '
+                local prefix = '\30\03' .. char_name .. '/' .. storage_name .. '\30\01'
                 local suffix = (quantity > 1 and ' \30\03' .. '(' .. quantity .. ')\30\01' or '')
 
                 local item_name
@@ -417,7 +449,11 @@ function display_search_results(result, from_all_chars, terms)
                 else
                     item_name = names.name
                 end
-                table.insert(results, prefix .. item_name .. suffix)
+                if duplicates then
+                    table.insert(results, item_name .. ': ' .. prefix .. suffix)
+                 else
+                    table.insert(results, prefix .. '\30\03: \30\01' .. item_name .. suffix)
+                end
             end
         end
     end
@@ -472,10 +508,13 @@ end
 
 
 function handle_command(args)
-    local char_include, char_exclude, terms, export = determine_query_elements(args)
+    local char_include, char_exclude, terms, export, duplicates = determine_query_elements(args)
     local result = search(char_include, char_exclude, terms)
+    if duplicates then
+        result = filter_duplicates(result)
+    end
     local all_chars = #char_include == 0 and #char_exclude == 0
-    display_search_results(result, all_chars, terms)
+    display_search_results(result, all_chars, terms, duplicates)
     if export ~=nil then
         export_to_file(result, export)
     end