Unbound DNS switcher script

UnboundUnbound

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+#!/bin/bash
+#Simple script to use standard DNS if Unbound (behind Adguard) is unavailable for some reason
+if [[ -z $1 ]]; then
+	SECONDS=60
+#	^ If nothing is specified, wait 60 seconds
+else
+	SECONDS=$1
+#       ^ If specified, wait however many seconds user specifies
+fi
+sleep $SECONDS
+if ! nc -vz localhost 53 >/dev/null 2>&1; then
+#	    ^ If you cannot connect to DNS port on local host
+	sed -i -e 's/192.168.0.66/1.1.1.1/g' /etc/resolv.conf
+#	^ replace local address with 1.1.1.1 (Cloudflare DNS)
+else
+	sed -i -e 's/1.1.1.1/192.168.0.66/g' /etc/resolv.conf	
+#	^ If connection is established, use local DNS
+fi