diff --git a/cluster/list.dir.without.owner.sh b/cluster/list.dir.without.owner.sh
new file mode 100755
index 0000000..b287579
--- /dev/null
+++ b/cluster/list.dir.without.owner.sh
@@ -0,0 +1,249 @@
+#!/bin/sh
+#
+# Purpose {{{
+# This script will try to get the list of directories that doesn't
+# have a owner known from the system
+#   1. …
+# …
+#
+# 2022-03-28
+# }}}
+# Vars {{{
+readonly PROGNAME=$(basename "${0}")
+readonly PROGDIR=$(readlink -m $(dirname "${0}"))
+readonly ARGS="${*}"
+readonly NBARGS="${#}"
+[ -z "${DEBUG}" ] && DEBUG=1
+## Export DEBUG for sub-script
+export DEBUG
+
+## Colors
+readonly PURPLE='\033[1;35m'
+readonly RED='\033[0;31m'
+readonly RESET='\033[0m'
+readonly COLOR_DEBUG="${PURPLE}"
+# }}}
+usage() {                                                       # {{{
+
+	cat <<- HELP
+usage: $PROGNAME [-d|-h]
+
+Try to give a description…
+
+EXAMPLES :
+    - Check the directories of the current place :
+        ${PROGNAME}
+
+OPTIONS :
+    --debug
+        Enable debug messages.
+
+    -h,--help
+        Print this help message.
+
+HELP
+
+}
+# }}}
+debug_message() {                                               # {{{
+
+	local_debug_message="${1}"
+
+	## Print message if DEBUG is enable (=0)
+	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME} : ${local_debug_message}"
+
+	unset local_debug_message
+
+	return 0
+}
+# }}}
+error_message() {                                               # {{{
+
+	local_error_message="${1}"
+	local_error_code="${2}"
+
+	## Print message
+	printf '%b\n' "ERROR − ${PROGNAME} : ${RED}${local_error_message}${RESET}"
+
+	exit "${local_error_code:=66}"
+}
+# }}}
+define_vars() {                                                 # {{{
+
+	## If path_to_check wasn't defined (argument) {{{
+	if [ -z "${path_to_check}" ]; then
+		## Use default value
+		readonly path_to_check=$(pwd)
+	fi
+	## }}}
+
+	## Temp file vars {{{
+	full_dir_list_path="/tmp/${PROGNAME}.full.list"
+	true > "${full_dir_list_path}"
+	unknow_dir_list_path="/tmp/${PROGNAME}.unkwon.list"
+	true > "${unknow_dir_list_path}"
+	## }}}
+}
+# }}}
+is_file_empty() {                                               # {{{
+
+	local_file="${1}"
+
+	## File is empty by default
+	return_is_file_empty="0"
+
+	## Check if the file is empty
+	if [ ! -s "${local_file}" ]; then
+		return_is_file_empty="0"
+		debug_message "is_file_empty − \
+The file ${RED}${local_file}${COLOR_DEBUG} is empty or doesn't exists."
+	else
+		return_is_file_empty="1"
+		debug_message "is_file_empty − \
+The file ${RED}${local_file}${COLOR_DEBUG} exists and has a size greater than zero."
+	fi
+
+	return "${return_is_file_empty}"
+
+}
+# }}}
+get_dir_list() {                                                # {{{
+
+	## Return False by default
+	return_get_dir_list="1"
+
+	## Get directories and exclude hidden
+	if command find "${path_to_check}" -mindepth 1 -maxdepth 1 -type d -not -iname '.*' -printf '%f\n' \
+		> "${full_dir_list_path}"; then
+		debug_message "get_dir_list − \
+${RED}${path_to_check}${COLOR_DEBUG} directories list successfully created (see ${full_dir_list_path} file)."
+		return_get_dir_list="0"
+	else
+		debug_message "get_dir_list − \
+Error in ${RED}find${COLOR_DEBUG} command for ${path_to_check} directory."
+		return_get_dir_list="1"
+	fi
+
+	return "${return_get_dir_list}"
+}
+# }}}
+
+main() {                                                        # {{{
+
+	## Define all vars
+	define_vars
+
+	## Get the list of all directories {{{
+	get_dir_list
+	## }}}
+	## Verify if directories list is empty {{{
+	### And EXIT with error message
+	is_file_empty "${full_dir_list_path}" \
+		&& error_message "The directories list of ${path_to_check} is empty (${full_dir_list_path} file)." 10
+	## }}}
+
+	## Parse directories list {{{
+	while IFS= read -r dir; do
+		### Get owner information {{{
+		debug_message "while loop - Try to get ${RED}${dir}${COLOR_DEBUG} owner information."
+		dir_owner_name="$(stat -c "%U" "${dir}" \
+			|| error_message "Can't stat ${dir} directory." 20)"
+		### }}}
+		### If owner is UNKNOWN {{{
+		if [ "${dir_owner_name}" = "UNKNOWN" ]; then
+			debug_message "while loop - Owner of ${dir} directory is no longer available on this system (${RED}${dir_owner_name}${COLOR_DEBUG})."
+			### Add this directory to specific list
+			printf '%b\n' "${dir}" >> "${unknow_dir_list_path}"
+		### }}}
+		### If owner is known from the system {{{
+		else
+			debug_message "while loop - Owner of ${dir} directory is ${RED}${dir_owner_name}${COLOR_DEBUG}, skip this directory."
+		fi
+		### }}}
+	done < "${full_dir_list_path}"
+	## }}}
+
+	## Clean temp file {{{
+	### full_dir_list_path if DEBUG is NOT enable
+	[ ! "${DEBUG}" -eq "0" ] && rm --force -- "${full_dir_list_path}"
+	## }}}
+
+	## If unknow_dir_list_path doesn't contains anything {{{
+	## Exit with success
+	is_file_empty "${unknow_dir_list_path}" \
+		&& debug_message "${path_to_check} doesn't contains any directory with unknown owner." \
+		&& exit 0
+	## }}}
+
+	## If some directories without owner are presents {{{
+	debug_message "${RED}${path_to_check}${COLOR_DEBUG} seems to contain some directories without owners. Please check the content of ${unknow_dir_list_path} file."
+	## }}}
+
+}
+# }}}
+
+# Manage arguments                                                # {{{
+# This code can't be in a function due to argument management
+
+if [ ! "${NBARGS}" -eq "0" ]; then
+
+	manage_arg="0"
+
+	## If the first argument is not an option
+	if ! printf -- '%s' "${1}" | grep -q -E -- "^-+";
+	then
+		## Print help message and exit
+		printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
+		printf '%b\n' "---"
+		usage
+
+		exit 1
+	fi
+
+	# Parse all options (start with a "-") one by one
+	while printf -- '%s' "${1}" | grep -q -E -- "^-+"; do
+
+	case "${1}" in
+		--debug )                             ## debug
+			DEBUG=0
+			;;
+		-h|--help )                           ## help
+			usage
+			## Exit after help informations
+			exit 0
+			;;
+		-d|--dir|--directory )                ## Define path_to_check with given arg
+			## Move to the next argument
+			shift
+			## Define var
+			readonly path_to_check="${1}"
+			;;
+		* )                                   ## unknow option
+			printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
+			printf '%b\n' "---"
+			usage
+			exit 1
+			;;
+	esac
+
+	debug_message "Arguments management − \
+${RED}${1}${COLOR_DEBUG} option managed."
+
+	## Move to the next argument
+	shift
+	manage_arg=$((manage_arg+1))
+
+	done
+
+	debug_message "Arguments management − \
+${RED}${manage_arg}${COLOR_DEBUG} argument(s) successfully managed."
+else
+	debug_message "Arguments management − \
+No arguments/options to manage."
+fi
+
+# }}}
+
+main
+
+exit 0