Shell script for troubleshooting DNS issue on Mac OS X

dns_troubleshooter.sh

#!/bin/bash -e
# Troubleshooting DNS issue on Mac OS X
LOGFILE=/tmp/dns_troubleshooter_$(date +%Y-%m-%d).log

function run() {
	echo "## interfaces: ifconfig -a"
	ifconfig -a

	echo
	echo "## dns settings"
	scutil --dns

	echo
	echo "## routing table: netstat -rn"
	netstat -rn

	echo
	echo "## traceroute 8.8.8.8"
	traceroute 8.8.8.8

	echo
	echo "## nslookup google.com"
	nslookup google.com

	echo
	echo "## nslookup baidu.cn"
	nslookup baidu.cn

	echo
	echo "DONE"
}

run 2>&1 | tee "$LOGFILE"