Script to put on crontab. Wakes a server if IP provided as parameter (e.g. 192.168.1.98) is currently connected to the network.

wake_server.sh

#!/usr/bin/env bash
# $1 should be an IP address

/usr/sbin/arp -d $1 > /dev/null 2>&1;
/usr/bin/arp-scan -l > /dev/null 2>&1;

[[ $(/usr/sbin/arp -n $1 | grep "ether") ]] && /usr/sbin/etherwake -b ETHERNET_ADDRESS_OF_SERVER_HERE;