First

Mon.sh

@@ -0,0 +1,72 @@
+#!/usr/bin/env bash
+# Webhost Availability Monitor - Single File - Loop
+# user only. keine root.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+INTERVAL=60
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+LOG_DIR="$ROOT_DIR/logs"
+HOSTS_FILE="$ROOT_DIR/hosts.txt"
+SEP=';'
+
+timestamp_iso() {
+  date -Iseconds
+}
+
+ensure_dirs() {
+  mkdir -p "$LOG_DIR"
+}
+
+current_logfile() {
+  printf "%s/%s.csv" "$LOG_DIR" "$(date +%F)"
+}
+
+write_header_if_needed() {
+  local file="$1"
+  if [ ! -f "$file" ] || [ ! -s "$file" ]; then
+    printf "timestamp${SEP}label${SEP}http_code\n" >>"$file"
+  fi
+}
+
+stop_requested=0
+_on_exit() {
+  stop_requested=1
+  printf "\nstop received. exit after current batch\n" >&2
+}
+trap _on_exit INT TERM
+
+ensure_dirs
+
+printf "loop start. 60s. logs dir: %s\n" "$LOG_DIR"
+
+while [ "$stop_requested" -eq 0 ]; do
+  logfile="$(current_logfile)"
+  write_header_if_needed "$logfile"
+
+  while IFS= read -r line; do
+    [ -z "$line" ] && continue
+    case "$line" in \#*) continue ;; esac
+
+    IFS='|' read -r label url expected <<<"$line"
+
+    ts="$(timestamp_iso)"
+    set +o errexit
+    code="$(curl -sS -o /dev/null -w "%{http_code}" --max-time 10 -L "$url" 2>/dev/null)" || code="000"
+    set -o errexit
+
+    printf "%s%s%s%s%s\n" "$ts" "$SEP" "$label" "$SEP" "$code" >>"$logfile"
+  done <"$HOSTS_FILE"
+
+  # interruptable sleep
+  waited=0
+  while [ "$waited" -lt "$INTERVAL" ] && [ "$stop_requested" -eq 0 ]; do
+    sleep 1
+    waited=$((waited+1))
+  done
+done
+
+printf "exit\n"

hosts.txt

@@ -0,0 +1,2 @@
+google|https://www.google.com|200
+Authentik-Tim|https://auth.st-server.org|200

logs/2025-11-10.csv

@@ -0,0 +1,5 @@
+timestamp;label;http_code
+2025-11-10T12:23:06+00:00;google;200
+2025-11-10T12:23:07+00:00;Authentik-Tim;503
+2025-11-10T12:24:08+00:00;google;200
+2025-11-10T12:24:08+00:00;Authentik-Tim;503