Update IOMMU-Groups.sh

Add IOMMU-Groups.sh: List PCI devices grouped by IOMMU group
This script scans IOMMU groups on the system and lists all associated PCI devices in a clear format.

Features:
- Lists each IOMMU group numerically.
- Displays detailed device info using lspci.
- Safe globbing with nullglob enabled.
- Works in headless and minimal environments (no color output).

Useful for troubleshooting PCIe passthrough setups in KVM/Proxmox environments.

tools/IOMMU-Groups.sh

@@ -1,19 +1,35 @@
 #!/bin/bash
-# 
+#
 # Script: IOMMU-Groups.sh
-# Goal: List PCI devices in IOMMU Groups
-# 
+# Goal: List PCI devices in IOMMU Groups (no color output)
+#
 # Author: Gabriel Luchina
 # https://luchina.com.br
-# 20211118T0010
+# Original: 20211118T0010
+# Updated: 2025-04-05
+#
+
+# Check for root privileges
+if [ "$EUID" -ne 0 ]; then
+  echo "Warning: It is recommended to run as root for full access."
+  echo "Press Enter to continue as a regular user, or CTRL+C to exit..."
+  read -r
+fi
 
 shopt -s nullglob
 
-for group in `ls /sys/kernel/iommu_groups/  | sort -V`
-do
-    echo "IOMMU Group ${group##*/}:"
-    for device in /sys/kernel/iommu_groups/$group/devices/*
-    do
-        echo -e "\t$(lspci -nns ${device##*/})"
+echo "IOMMU Group Devices:"
+
+for group in $(ls /sys/kernel/iommu_groups/ | sort -V); do
+    group_num=$(echo "$group" | sed 's/[^0-9]*//g')
+    echo "Group $group_num:"
+    for device in /sys/kernel/iommu_groups/$group/devices/*; do
+        dev_id="${device##*/}"
+        info=$(lspci -nns "$dev_id" 2>/dev/null || true)
+        if [[ -z "$info" ]]; then
+            echo -e "\t$dev_id (Unable to get info)"
+        else
+            echo -e "\t$info"
+        fi
     done
 done