Updated.

polybar/scripts/bat_toggle.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+updates=$(xbps-install -Mun 2> /dev/null | wc -l)
+
+if [ -n "$updates" ] && [ "$updates" -gt 0 ]; then
+    echo " $updates"
+else
+    echo ""
+fi