Wake-On-Lan Magic Packet using netcat in bash

send-magic-packet.sh

#!/usr/bin/env bash

mac_address=$1
# Strip colons from the MAC address
mac_address=$(echo $mac_address | sed 's/://g')

broadcast=$2
port=4343

# Magic packets consist of 12*`f` followed by 16 repetitions of the MAC address
magic_packet=$(
  printf 'f%.0s' {1..12}
  printf "$mac_address%.0s" {1..16}
)
# ... and they need to be hex-escaped
magic_packet=$(
  echo $magic_packet | sed -e 's/../\\x&/g'
)

# echo $magic_packet
echo -e $magic_packet | nc -w1 -u $broadcast $port

thing I did: add -b and broadcast to 255.255.255.255 to wake the device anywhere on the LAN

what if my router can't accept any parameters in nc (-u)?

Hello.

I have a improvement for your script.
Change var: mac_address
From:
mac_address=$(echo $mac_address | sed 's/://g')
To:
mac_address=$(echo $mac_address | sed 's/[ :-]//g')

Then it will work with four mac formats.
Ex:
74:e6:e2:aa:aa:aa #Linux
74-e6-e2-aa-aa-aa #Windows
"74 e6 e2 aa aa aa" #Space
74e6e2aaaaaa #All close

oh yeah, sed has slight different syntaxes depending on the OS. Maybe it'll be better to use perl instead.