Update /etc/hosts of two machines with pre configured host name. Helpful if there's no DNS resolve unit in the local network.

updatePeerAddress.sh

#!/bin/bash

if [ $# -eq 0 ]
  then
    echo "supply the peer IP address"
    exit 1
fi

SUBNET_PREFIX=192
MY_HOST=me.test
PEER_HOST=me.test.peer
PEER_USER=

MY_ADDRESS=$(ifconfig | grep $SUBNET_PREFIX | awk '{ print $2 }')
echo "Setting $MY_HOST IP to" $MY_ADDRESS
echo "Setting $PEER_HOST IP to" $1

sed -i "s/.*$PEER_HOST/$1 $PEER_HOST/g; s/.*$MY_HOST$/$MY_ADDRESS $MY_HOST/g" /etc/hosts

echo "Testing"
ping -c 2 $MY_HOST
ping -c 2 $PEER_HOST

echo "Update peer hosts"
ssh -t $PEER_USER@$PEER_HOST "sudo sed -i '' 's/.*$PEER_HOST/$1 $PEER_HOST/g; s/.*$MY_HOST$/$MY_ADDRESS $MY_HOST/g' /etc/hosts"