Replace echo -e with printf for portability

Converted all echo -e commands to printf for better portability
across different systems and shells. Printf is POSIX-compliant
and behaves consistently.

Updated functions:
- colorize_health(): Uses printf %b for escape sequences
- colorize_temp(): Uses printf %b for escape sequences
- colorize_header(): Uses printf with newline
- log_error(), log_warn(), log_info(): Uses printf for stderr

Also simplified header output by calling colorize_header directly
since it now handles its own newline.

Fixes: #19

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

driveAtlas.sh

@@ -129,12 +129,12 @@ colorize_health() {
     local health="$1"
     if [[ "$USE_COLOR" == true ]]; then
         if [[ "$health" == "✓" ]]; then
-            echo -e "${COLOR_GREEN}${health}${COLOR_RESET}"
+            printf '%b%s%b' "$COLOR_GREEN" "$health" "$COLOR_RESET"
         else
-            echo -e "${COLOR_RED}${health}${COLOR_RESET}"
+            printf '%b%s%b' "$COLOR_RED" "$health" "$COLOR_RESET"
         fi
     else
-        echo "$health"
+        printf '%s' "$health"
     fi
 }
 
@@ -157,14 +157,14 @@ colorize_temp() {
     temp_val="${temp_str%°C}"
     if [[ "$temp_val" =~ ^[0-9]+$ ]]; then
         if [[ "$temp_val" -ge 60 ]]; then
-            echo -e "${COLOR_RED}${temp_str}${COLOR_RESET}"
+            printf '%b%s%b' "$COLOR_RED" "$temp_str" "$COLOR_RESET"
         elif [[ "$temp_val" -ge 50 ]]; then
-            echo -e "${COLOR_YELLOW}${temp_str}${COLOR_RESET}"
+            printf '%b%s%b' "$COLOR_YELLOW" "$temp_str" "$COLOR_RESET"
         else
-            echo -e "${COLOR_GREEN}${temp_str}${COLOR_RESET}"
+            printf '%b%s%b' "$COLOR_GREEN" "$temp_str" "$COLOR_RESET"
         fi
     else
-        echo "$temp_str"
+        printf '%s' "$temp_str"
     fi
 }
 
@@ -176,9 +176,9 @@ colorize_temp() {
 #------------------------------------------------------------------------------
 colorize_header() {
     if [[ "$USE_COLOR" == true ]]; then
-        echo -e "${COLOR_BLUE}${COLOR_BOLD}$1${COLOR_RESET}"
+        printf '%b%b%s%b\n' "$COLOR_BLUE" "$COLOR_BOLD" "$1" "$COLOR_RESET"
     else
-        echo "$1"
+        printf '%s\n' "$1"
     fi
 }
 
@@ -190,9 +190,9 @@ colorize_header() {
 #------------------------------------------------------------------------------
 log_error() {
     if [[ "$USE_COLOR" == true ]]; then
-        echo -e "${COLOR_RED}ERROR:${COLOR_RESET} $1" >&2
+        printf '%bERROR:%b %s\n' "$COLOR_RED" "$COLOR_RESET" "$1" >&2
     else
-        echo "ERROR: $1" >&2
+        printf 'ERROR: %s\n' "$1" >&2
     fi
 }
 
@@ -205,9 +205,9 @@ log_error() {
 log_warn() {
     if [[ "$VERBOSE" == true ]]; then
         if [[ "$USE_COLOR" == true ]]; then
-            echo -e "${COLOR_YELLOW}WARN:${COLOR_RESET} $1" >&2
+            printf '%bWARN:%b %s\n' "$COLOR_YELLOW" "$COLOR_RESET" "$1" >&2
         else
-            echo "WARN: $1" >&2
+            printf 'WARN: %s\n' "$1" >&2
         fi
     fi
 }
@@ -221,9 +221,9 @@ log_warn() {
 log_info() {
     if [[ "$VERBOSE" == true ]]; then
         if [[ "$USE_COLOR" == true ]]; then
-            echo -e "${COLOR_CYAN}INFO:${COLOR_RESET} $1" >&2
+            printf '%bINFO:%b %s\n' "$COLOR_CYAN" "$COLOR_RESET" "$1" >&2
         else
-            echo "INFO: $1" >&2
+            printf 'INFO: %s\n' "$1" >&2
         fi
     fi
 }
@@ -851,7 +851,7 @@ if [[ "$SKIP_CEPH" != true ]]; then
 fi
 
 printf "\n"
-echo -e "$(colorize_header '=== Drive Details with SMART Status (by Bay Position) ===')"
+colorize_header '=== Drive Details with SMART Status (by Bay Position) ==='
 if [[ "$SHOW_PCI" == true ]]; then
     printf "%-5s %-15s %-10s %-8s %-8s %-8s %-30s %-20s %-12s %-10s %-10s %-30s %-40s\n" "BAY" "DEVICE" "SIZE" "TYPE" "TEMP" "HEALTH" "MODEL" "SERIAL" "CEPH OSD" "STATUS" "USAGE" "WARNINGS" "PCI PATH"
     echo "----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------"
@@ -1007,7 +1007,7 @@ if [[ -n "$nvme_devices" ]]; then
 
     if [[ -n "$unmapped_nvme" ]]; then
         printf "\n"
-        echo -e "$(colorize_header '=== Unmapped NVMe Drives ===')"
+        colorize_header '=== Unmapped NVMe Drives ==='
         printf "%-15s %-10s %-10s %-40s %-25s\n" "DEVICE" "SIZE" "TYPE" "MODEL" "SERIAL"
         echo "------------------------------------------------------------------------------------------------------"
         echo "$unmapped_nvme" | while read -r name size; do
@@ -1032,7 +1032,7 @@ fi
 rbd_devices=$(lsblk -d -n -o NAME,SIZE,TYPE 2>/dev/null | grep "rbd" | sort -V)
 if [ -n "$rbd_devices" ]; then
     printf "\n"
-    echo -e "$(colorize_header '=== Ceph RBD Devices ===')"
+    colorize_header '=== Ceph RBD Devices ==='
     printf "%-15s %-10s %-10s %-30s\n" "DEVICE" "SIZE" "TYPE" "MOUNTPOINT"
     echo "------------------------------------------------------------"
     echo "$rbd_devices" | while read -r name size type; do
@@ -1046,7 +1046,7 @@ fi
 # Show mapping diagnostic info if DEBUG is set
 if [[ -n "$DEBUG" ]]; then
     printf "\n"
-    echo -e "$(colorize_header '=== DEBUG: Drive Mappings ===')"
+    colorize_header '=== DEBUG: Drive Mappings ==='
     for key in "${!DRIVE_MAP[@]}"; do
         echo "Bay $key: ${DRIVE_MAP[$key]}"
     done | sort -n