Show capture statistics immediately after capture completes

- Display stats right after 'Capturing packets' line completes
- Show packet count, PLCP count, and packet rate immediately
- Move sample packets display after stats
- Reorganize output for better readability

Co-authored-by: Cursor <cursoragent@cursor.com>

test_monitor_tshark.sh

@@ -118,6 +118,8 @@ echo ""
 
 # Capture for specified duration and count packets
 echo "Capturing packets for $DURATION seconds..."
+
+# Run capture in background and show progress
 CAPTURE_OUTPUT=$(timeout "$DURATION" tshark -i "$INTERFACE" -n -T fields \
     -e frame.number \
     -e frame.time \
@@ -130,32 +132,45 @@ CAPTURE_OUTPUT=$(timeout "$DURATION" tshark -i "$INTERFACE" -n -T fields \
     2>&1)
 CAPTURE_EXIT_CODE=$?
 
-# Show any warnings/errors
-echo "$CAPTURE_OUTPUT" | grep -E "(tshark:|Warning|Error)" | head -5 || true
+# Immediately show stats after capture completes
+echo ""
+echo "=== Capture Statistics ==="
 
-# Display first 50 lines of packet output
-PACKET_LINES=$(echo "$CAPTURE_OUTPUT" | grep -E '^[0-9]+' || true)
-if [ -n "$PACKET_LINES" ]; then
-    echo ""
-    echo "Sample packets (first 20):"
-    echo "$PACKET_LINES" | head -20
-else
-    echo ""
-    echo "(No packets captured)"
+# Show any warnings/errors
+WARNINGS=$(echo "$CAPTURE_OUTPUT" | grep -E "(tshark:|Warning|Error)" | head -5 || true)
+if [ -n "$WARNINGS" ]; then
+    echo "$WARNINGS"
 fi
 
 # Count total packets captured (lines starting with a number)
-FINAL_COUNT=$(echo "$CAPTURE_OUTPUT" | grep -E '^[0-9]+' | wc -l || echo "0")
+PACKET_LINES=$(echo "$CAPTURE_OUTPUT" | grep -E '^[0-9]+' || true)
+FINAL_COUNT=$(echo "$PACKET_LINES" | wc -l || echo "0")
 
 # Count packets with PLCP headers (radiotap present)
 # radiotap.present field is the 8th field (after frame.number, frame.time, wlan.sa, wlan.da, wlan.fc.type, wlan.fc.subtype, wlan.fc.type_subtype)
-PLCP_COUNT=$(echo "$CAPTURE_OUTPUT" | awk -F'\t' 'NF >= 8 && $1 != "" && $8 != "" && $8 != "0" && $8 != "-" {count++} END {print count+0}' || echo "0")
+PLCP_COUNT=$(echo "$PACKET_LINES" | awk -F'\t' 'NF >= 8 && $1 != "" && $8 != "" && $8 != "0" && $8 != "-" {count++} END {print count+0}' || echo "0")
 
-echo ""
-echo "=== Capture complete ==="
+# Display stats immediately
 echo "Total packets captured: $FINAL_COUNT"
 echo "PLCP headers: $PLCP_COUNT"
+if [ "$FINAL_COUNT" -gt 0 ]; then
+    # Calculate rate
+    RATE=$(awk "BEGIN {printf \"%.1f\", $FINAL_COUNT / $DURATION}")
+    echo "Packet rate: $RATE packets/second"
+fi
 echo ""
+
+# Display sample packets
+if [ -n "$PACKET_LINES" ] && [ "$FINAL_COUNT" -gt 0 ]; then
+    echo "Sample packets (first 20):"
+    echo "$PACKET_LINES" | head -20
+    echo ""
+else
+    echo "(No packets captured)"
+    echo ""
+fi
+
+echo "=== Summary ==="
 if [ "$FINAL_COUNT" -gt 0 ]; then
     echo "✓ Monitor mode is working! Captured $FINAL_COUNT packet(s)"
     if [ "$PLCP_COUNT" -gt 0 ]; then