/usr/share/doc/sendip/contrib/wake.sh is in sendip 2.5-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | #! /bin/sh
# Usage: wake <host> [<MAC address>]
#
# <host> can be a host name or a dotted-quad IP address.
# If the <MAC address> is not given, it is taken from ethers(5).
# For this to work, if you give a host name as first argument, ethers
# has to contain host names (as opposed to IP addresses).
#
# Unless you have it already, you can build your ethers file like this:
#
# nmap -sP -PI 192.168.1.0/24 # prepare ARP cache with a ping-sweep
# arp -a | awk '$5 == "[ether]" { printf("%s\t%s\n", $4, $1); }' \
# | sort >>/etc/ethers
#
# The 'magic packet' consists of 6 times 0xFF followed by 16 times
# the hardware address of the NIC. This sequence can be encapsulated
# in any kind of packet; I chose UDP to the discard port (9).
if [ $# = 1 ]; then
ETHER=`awk "/$1/"' { gsub(":", "", $1); print $1; exit; }' /etc/ethers`
if [ -z $ETHER ]; then
echo "$0: host $1 is not in /etc/ethers" >&2
exit 1
fi
ETHER=`echo $ETHER | sed 's/://g'`
else
ETHER=$2
fi
ETHER="${ETHER}${ETHER}${ETHER}${ETHER}" # 4 x MAC
ETHER="FFFFFFFFFFFF${ETHER}${ETHER}${ETHER}${ETHER}" # Preamble + 16 x MAC
sendip $1 -p ipv4 -p udp.so -ud 9 -d 0x"$ETHER"
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