tools -> scripts

scripts/duckdns/.env.example

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+DUCK_TOKEN=
+DUCK_DOMAINS=
+DUCK_IP=

scripts/duckdns/.gitignore

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+.env
+*.log

scripts/duckdns/install.sh

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+#!/bin/bash
+thisdir="$( dirname "$(readlink -e -- "${BASH_SOURCE[0]}")")"
+
+# https://www.duckdns.org/install.jsp
+
+croncmd="$thisdir/update.sh"
+cronjob="*/30 * * * * $croncmd" # every 30 min
+( crontab -l | grep -v -F "$croncmd" ; echo "$cronjob" ) | crontab -
+cp -f "$thisdir/.env.example" "$thisdir/.env"

scripts/duckdns/uninstall.sh

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+#!/bin/bash
+
+( crontab -l | grep -v -F "duckdns" ) | crontab -

scripts/duckdns/update.sh

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+#!/bin/bash
+# shellcheck disable=SC1091
+thisdir="$( dirname "$(readlink -e -- "${BASH_SOURCE[0]}")")"
+
+log() {
+    timestamp="$(date +'%Y-%m-%d %H:%M:%S')"
+    datestamp="$(date +'%Y-%m-%d')"
+    [ ! -d "$thisdir/log" ] && mkdir "$thisdir/log"
+    echo "[$timestamp] $*" >> "$thisdir/log/$datestamp.log"
+}
+
+[ ! -f "$thisdir/.env" ] && {
+    log "ERROR: .env not exists"
+    exit 1
+}
+
+source "$thisdir/.env"
+
+[ -z "$DUCK_TOKEN" ] && {
+    log "ERROR: env var DUCK_TOKEN not specified"
+    exit 1
+}
+
+[ -z "$DUCK_DOMAINS" ] && {
+    log "ERROR: env var DUCK_DOMAINS not specified"
+    exit 1
+}
+
+result=$(curl -s "https://www.duckdns.org/update?domains=${DUCK_DOMAINS}&token=${DUCK_TOKEN}&ip=${DUCK_IP}")
+log "$result"