Scripts to sleep and wake machines if I'm at home

suspend.sh

#!/usr/bin/env bash
set -uf -o pipefail;

usage="./suspend.sh 22";

: ${1?"Usage: $0 SSH port ($usage)"}

inbound=$(netstat -n --protocol inet | grep ":$1");

if [[ "$inbound" = "" ]];
then
    /usr/sbin/pm-suspend;
else
    exit 1;
fi

wake.sh

#!/usr/bin/env bash
set -euf -o pipefail;

usage="./wake.sh 192.168.1.98 ue0 xx:xx:xx:xx:xx:xx 192.168.1.255";
phone_connected=0;

: ${1?"Usage: $0 phone's LAN IP address ($usage)"}
: ${2?"Usage: $0 network interface (eth0 etc) ($usage)"}
: ${3?"Usage: $0 comma separated machine ethernet addresses ($usage)"}
: ${4?"Usage: $0 network broadcast address ($usage)"}

scan_cache=$(/usr/local/bin/arp-scan -l); # Build a new arp cache

[[ $(/usr/sbin/arp -i $2 $1 | grep 'expires') ]] && phone_connected=1;

if [[ $phone_connected -eq 0 ]];
then
    echo "Phone isn't connected";
    exit 1;
fi
# else continue and wake things up

IFS=',' read -ra addresses <<< "$3";

for ethernet in "${addresses[@]}";
do
    /usr/local/bin/wakeonlan -i $4 $ethernet;
done