Update DNSimple record with current ip (dynamic DNS).

update-dnsimple.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>io.yalty.update-dnsimple</string>
    <key>ProgramArguments</key>
    <array>
        <string>sh</string>
        <string>/.../update-dnsimple.sh</string>
    </array>
    <key>StartInterval</key>
    <integer>60</integer>
</dict>
</plist>

update-dnsimple.sh

#!/usr/bin/env sh
set -e

TOKEN=""
ACCOUNT=""
ZONE=""
RECORD=""
IP=$(curl -s http://icanhazip.com/)
CACHE_FILE=/tmp/${0##*/}.cache

if [[ -f $CACHE_FILE && "$IP" = "$(cat $CACHE_FILE)" ]]; then
  echo "IP ($IP) already set on dnsimple"
  exit 0
fi

curl -H "Authorization: Bearer $TOKEN" \
     -H "Accept: application/json" \
     -H "Content-Type: application/json" \
     -X "PATCH" \
     -d "{\"content\":\"$IP\"}" \
     --fail -sS \
     "https://api.dnsimple.com/v2/$ACCOUNT/zones/$ZONE/records/$RECORD" \
     >/dev/null

echo $IP > $CACHE_FILE
echo "IP ($IP) updated on dnsimple"