diff --git a/cachestats.sh b/cachestats.sh
index 09378e9..c4aafe0 100644
--- a/cachestats.sh
+++ b/cachestats.sh
@@ -5,50 +5,63 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 # Copyright 2023 Forza <forza@tnonline.net>
 
-device_name="$1"
 
-# Declare an associative array to store key-value pairs
-declare -A data
-declare -i sizess
+# cacheatats usage
+usage() {
+	echo "Usage: $(basename "${0}") [DEVICE_NAME or PATH] [DEVICE_NAME or PATH] ..."
+	echo "  -h, --help  Display this help message"
+}
+
+# Check for help option or no arguments
+if [ "$#" -eq 0 ]; then
+    usage
+    exit 1
+fi
+if [ "${1:0:1}" == "-" ]; then
+	case "$1" in
+		-h|--help)
+			usage
+			exit 1
+			;;
+		*)
+			echo "Invalid option: $1"
+			usage
+			exit 1
+			;;
+		esac
+fi
+
+# Declare used variables
+declare -A data    		# associative array
+declare -a dmstatus		# indexed array
+declare -i sizess  		# integer variable
 declare status_output
-declare -a dmstatus
+declare device_name_or_path
+declare device_name
 
 # Function to convert bytes to IEC units
 to_iec() {
-	local bytes kib mib gib tib
+	local -i bytes kib mib gib tib # integers
 	bytes=$1
 	kib=$(( (bytes + 512) / 1024 ))
-	mib=$(( (kib + 512) / 1024 ))
-	gib=$(( (mib + 512) / 1024 ))
-	tib=$(( (gib + 512) / 1024 ))
+	mib=$((   (kib + 512) / 1024 ))
+	gib=$((   (mib + 512) / 1024 ))
+	tib=$((   (gib + 512) / 1024 ))
 	if [ $tib -gt 0 ]; then
-		echo "${tib} TiB"
+		echo "$tib TiB"
 	elif [ $gib -gt 0 ]; then
-		echo "${gib} GiB"
+		echo "$gib GiB"
 	elif [ $mib -gt 0 ]; then
-		echo "${mib} MiB"
+		echo "$mib MiB"
 	elif [ $kib -gt 0 ]; then
-		echo "${kib} KiB"
+		echo "$kib KiB"
 	else
-		echo "${bytes} bytes"
+		echo "$bytes bytes"
 	fi
 }
+debug_output(){
+	# DEBUG info
 
-# Get the status output using dmsetup
-status_output=$(dmsetup status "$device_name" 2>/dev/null)
-
-# Check if the device exists and has valid output
-if [ -n "$status_output" ]; then
-	sizess=$(blockdev --getss "/dev/mapper/${device_name}")
-	
-	# Parse the status information into the associative array
-	IFS='/: ' read -r -a dmstatus <<< "$status_output"
-	
-	## Ouput `dmsetup status` raw data:
-	#	for ((i = 0; i < ${#dmstatus[@]}; i += 1)); do
-	#		echo \# $i: ${dmstatus["$i"]}
-	#	done
-	
 	# Field order of `dmsetup status <cachedev>`:
 	# https://www.kernel.org/doc/html/latest/admin-guide/device-mapper/cache.html
 	#
@@ -59,77 +72,112 @@ if [ -n "$status_output" ]; then
 	# <#core args> <core args>* <policy name> <#policy args> <policy args>*
 	# <cache metadata mode>
 
-	data["name"]="$device_name"
-	data["origin_start"]=$(( ${dmstatus[0]} * $sizess )) # in sectors
-	data["origin_length"]=$(( ${dmstatus[1]} * $sizess )) # in sectors
-	data["table_type"]="${dmstatus[2]}"
-	data["metadata_block_size"]=$(( ${dmstatus[3]} * $sizess )) # in sectors
-	data["used_metadata_blocks"]="${dmstatus[4]}"
-	data["total_metadata_blocks"]="${dmstatus[5]}"
-	data["cache_block_size"]=$(( ${dmstatus[6]} * $sizess )) # in sectors
-	data["used_cache_blocks"]="${dmstatus[7]}"
-	data["total_cache_blocks"]="${dmstatus[8]}"
-	data["read_hits"]="${dmstatus[9]}"
-	data["read_misses"]="${dmstatus[10]}"
-	data["write_hits"]="${dmstatus[11]}"
-	data["write_misses"]="${dmstatus[12]}"
-	data["demotions"]="${dmstatus[13]}"
-	data["promotions"]="${dmstatus[14]}"
-	data["dirty_cache"]=$(( ${dmstatus[15]} * ${data[cache_block_size]} ))
-	if [ "${dmstatus[16]}" = 2 ]; then
-		data["cache_type"]="${dmstatus[17]}"
-		data["discard_passdown"]="${dmstatus[18]}"
-		data["migration_threshold"]=$(( ${dmstatus[21]} * $sizess ))
-		data["cache_policy"]="${dmstatus[22]}"
-		data["smq_count"]="${dmstatus[23]}"
-		data["cache_rw"]="${dmstatus[24]}"
-		data["status"]="${dmstatus[25]//-/OK}"
-	else
-		data["cache_type"]="${dmstatus[17]}"
-		data["discard_passdown"]="true"
-		data["migration_threshold"]=$(( ${dmstatus[20]} * $sizess ))
-		data["cache_policy"]="${dmstatus[21]}"
-		data["smq_count"]="${dmstatus[22]}"
-		data["cache_rw"]="${dmstatus[23]}"
-		data["status"]="${dmstatus[24]//-/OK}"
+	# Loop through throuh all fields to list and print their values
+	if (( DEBUG > 0 )) ; then
+		printf "\nDEBUG INFO\n"
+		printf "========\n"
+		printf "dmstatus index: value\n"
+		## Ouput `dmsetup status` raw data:
+		for ((i = 0; i < ${#dmstatus[@]}; i += 1)); do
+			echo "# $i: ${dmstatus[$i]}"
+		done
+		printf "\nidentified values:\n"
+			printf "========\n"
+		for field in "${!data[@]}"; do
+				value="${data[$field]}"
+				if [ -n "$value" ]; then
+					echo "$field : $value"
+				else
+					echo "Field '$field' not found."
+				fi
+			done | sort
+		printf "========\n"
 	fi
+}
 
-# Loop through throuh all fields to list and print their values
-#	for field in "${!data[@]}"; do
-#		value="${data[$field]}"
-#		if [ -n "$value" ]; then
-#			echo "$field : $value"
-#		else
-#			echo "Field '$field' not found."
-#		fi
-#	done |sort
+# Loop through all devices and print their info
+for device_name_or_path in "${@}"; do
 
-	# Output defined fields
-	printf "DEVICE\n"
-	printf "========\n"
-	printf "%-*s%s\n" "26" "Device-mapper name: " "/dev/mapper/${data[name]}"
-	printf "%-*s%s\n" "26" "Origin size: " "$(to_iec $(( ${data[origin_length]} - ${data[origin_start]} )) )"
-	printf "%-*s%s\n" "26" "Discards: " "${data[discard_passdown]}"
+	# Strip path part from device name
+	device_name=$(basename "${device_name_or_path}")
 
-	printf "\n"
-	printf "CACHE\n"
-	printf "========\n"
-	printf "%-*s%s\n" "26" "Size / Usage: " "$(to_iec $((${data[total_cache_blocks]} * ${data[cache_block_size]}))) / $(to_iec $(( ${data[used_cache_blocks]} * ${data[cache_block_size]} ))) ($(( 100 * ${data[used_cache_blocks]} / ${data[total_cache_blocks]} )) %)"
-	printf "%-*s%s\n" "26" "Read Hit Rate: " "${data[read_hits]} / $((${data[read_misses]} + ${data[read_hits]})) ($(( 100 * ${data[read_hits]} / (${data[read_hits]} + ${data[read_misses]}) )) %)"
-	printf "%-*s%s\n" "26" "Write Hit Rate: " "${data[write_hits]} / $((${data[write_misses]} + ${data[write_hits]})) ($(( 100 * ${data[write_hits]} / (${data[write_hits]} + ${data[write_misses]}) )) %)"
-	printf "%-*s%s\n" "26" "Dirty: " "$(to_iec ${data[dirty_cache]})"
-	printf "%-*s%s\n" "26" "Block Size: " "$(to_iec ${data[cache_block_size]})"
-	printf "%-*s%s\n" "26" "Promotions / Demotions: " "${data[promotions]} / ${data[demotions]}"
-	printf "%-*s%s\n" "26" "Migration Threshold: " "$(to_iec ${data[migration_threshold]})"
-	printf "%-*s%s\n" "26" "Read-Write mode: " "${data[cache_rw]}"
-	printf "%-*s%s\n" "26" "Type: " "${data[cache_type]}"
-	printf "%-*s%s\n" "26" "Policy: " "${data[cache_policy]}"
-	printf "%-*s%s\n" "26" "Status: " "${data[status]}"
+	# Get the status output using dmsetup
+	status_output=$(dmsetup status "${device_name}" 2>/dev/null)
 
-	printf "\n"
-	printf "METADATA\n"
-	printf "========\n"
-	printf "%-*s%s\n" "26" "Size / Usage: " "$(to_iec $(( ${data[total_metadata_blocks]} * ${data[metadata_block_size]} ))) / $(to_iec $(( ${data[used_metadata_blocks]} * ${data[metadata_block_size]} ))) ($(( 100 * ${data[used_metadata_blocks]} / ${data[total_metadata_blocks]} )) %)"
-else
-    echo "Device not found or no valid status output."
-fi
+	# Check if the device exists and has valid output
+	if [ -n "$status_output" ]; then
+		# Check device block size
+		sizess=$(blockdev --getss "/dev/mapper/${device_name}")
+
+		# Parse the dmstatus information into the associative array
+		IFS='/: ' read -r -a dmstatus <<< "${status_output}"
+
+		# Populate the data array
+		data["name"]="$device_name"
+		data["origin_start"]=$(( dmstatus[0] * sizess )) # in sectors
+		data["origin_length"]=$(( dmstatus[1] * sizess )) # in sectors
+		data["table_type"]="${dmstatus[2]}"
+		data["metadata_block_size"]=$(( dmstatus[3] * sizess )) # in sectors
+		data["used_metadata_blocks"]="${dmstatus[4]}"
+		data["total_metadata_blocks"]="${dmstatus[5]}"
+		data["cache_block_size"]=$(( dmstatus[6] * sizess )) # in sectors
+		data["used_cache_blocks"]="${dmstatus[7]}"
+		data["total_cache_blocks"]="${dmstatus[8]}"
+		data["read_hits"]="${dmstatus[9]}"
+		data["read_misses"]="${dmstatus[10]}"
+		data["write_hits"]="${dmstatus[11]}"
+		data["write_misses"]="${dmstatus[12]}"
+		data["demotions"]="${dmstatus[13]}"
+		data["promotions"]="${dmstatus[14]}"
+		data["dirty_cache"]=$(( dmstatus[15] * data[cache_block_size] ))
+		if [ "${dmstatus[16]}" = 2 ]; then
+			data["cache_type"]="${dmstatus[17]}"
+			data["discard_passdown"]="${dmstatus[18]}"
+			data["migration_threshold"]=$(( dmstatus[21] * sizess ))
+			data["cache_policy"]="${dmstatus[22]}"
+			data["smq_count"]="${dmstatus[23]}"
+			data["cache_rw"]="${dmstatus[24]}"
+			data["status"]="${dmstatus[25]//-/OK}"
+		else
+			data["cache_type"]="${dmstatus[17]}"
+			data["discard_passdown"]="true"
+			data["migration_threshold"]=$(( dmstatus[20] * sizess ))
+			data["cache_policy"]="${dmstatus[21]}"
+			data["smq_count"]="${dmstatus[22]}"
+			data["cache_rw"]="${dmstatus[23]}"
+			data["status"]="${dmstatus[24]//-/OK}"
+		fi
+
+		# Print debug information
+		debug_output
+
+		# Print dm-cache data
+		printf "\nDEVICE\n"
+		printf "========\n"
+		printf "%-*s%s\n" "26" "Device-mapper name: " "/dev/mapper/${data[name]}"
+		printf "%-*s%s\n" "26" "Origin size: " "$(to_iec $(( data[origin_length] - data[origin_start] )) )"
+		printf "%-*s%s\n" "26" "Discards: " "${data[discard_passdown]}"
+
+		printf "\n"
+		printf "CACHE\n"
+		printf "========\n"
+		printf "%-*s%s\n" "26" "Size / Usage: " "$(to_iec $(( data[total_cache_blocks] * data[cache_block_size] ))) / $(to_iec $(( data[used_cache_blocks] * data[cache_block_size] ))) ($(( 100 * data[used_cache_blocks] / data[total_cache_blocks] )) %)"
+		printf "%-*s%s\n" "26" "Read Hit Rate: " "${data[read_hits]} / $(( data[read_misses] + data[read_hits] )) ($(( 100 * data[read_hits] / (data[read_hits] + data[read_misses] ) )) %)"
+		printf "%-*s%s\n" "26" "Write Hit Rate: " "${data[write_hits]} / $(( data[write_misses] + data[write_hits] )) ($(( 100 * data[write_hits] / ( data[write_hits] + data[write_misses] ) )) %)"
+		printf "%-*s%s\n" "26" "Dirty: " "$(to_iec "${data[dirty_cache]}")"
+		printf "%-*s%s\n" "26" "Block Size: " "$(to_iec "${data[cache_block_size]}")"
+		printf "%-*s%s\n" "26" "Promotions / Demotions: " "${data[promotions]} / ${data[demotions]}"
+		printf "%-*s%s\n" "26" "Migration Threshold: " "$(to_iec "${data[migration_threshold]}")"
+		printf "%-*s%s\n" "26" "Read-Write mode: " "${data[cache_rw]}"
+		printf "%-*s%s\n" "26" "Type: " "${data[cache_type]}"
+		printf "%-*s%s\n" "26" "Policy: " "${data[cache_policy]}"
+		printf "%-*s%s\n" "26" "Status: " "${data[status]}"
+
+		printf "\n"
+		printf "METADATA\n"
+		printf "========\n"
+		printf "%-*s%s\n" "26" "Size / Usage: " "$(to_iec $(( data[total_metadata_blocks] * data[metadata_block_size] ))) / $(to_iec $(( data[used_metadata_blocks] * data[metadata_block_size] ))) ($(( 100 * data[used_metadata_blocks] / data[total_metadata_blocks] )) %)"
+	else
+	    echo "Device not found or no valid status output."
+	fi
+done