Monitor with
Confidence

1#!/bin/bash
2
3# --- Manifest --- #
4# name: System Updates
5# description: Checking for system updates on Debian/Ubuntu
6# version: 1.0
7# schedule: *:0/01:00
8# timeout: 20
9
10# ... (rest of standard blocks)
11
12# --- Main --- #
13# Check for both standard and security updates
14updates=$(/usr/lib/update-notifier/apt-check 2>&1)
15
16# apt-check outputs two numbers separated by a semicolon:
17# standard_updates;security_updates
18IFS=';' read -ra update_array <<< "$updates"
19total_updates=${update_array[0]}
20security_updates=${update_array[1]}
21
22# Check if there are any updates
23if [ "$total_updates" -gt 0 ]; then
24# If there are updates, output the count for both types
25echo "$TIMESTAMP, $STATUS_UPDATE, $total_updates $MSG_UPDATE_AVAILABLE ($security_updates $MSG_SECURITY_UPDATES)"
26else
27# If there are no updates, output "ok"
28echo "$TIMESTAMP, $STATUS_OK, $MSG_OK"
29fi
30
31exit 0 # Success
32
33# Note: Output status to stdout (captured by systemd)

12025-09-29 23:59:12, OK, System is up to date
22025-09-30 00:00:02, OK, System is up to date
32025-09-30 00:01:03, OK, System is up to date
42025-09-30 00:02:00, OK, System is up to date
52025-09-30 00:03:05, OK, System is up to date
6...
72025-09-30 00:20:22, UPDATE, 2 available updates (2 security updates)
82025-09-30 00:21:32, UPDATE, 2 available updates (2 security updates)
92025-09-30 00:22:08, UPDATE, 2 available updates (2 security updates)
102025-09-30 00:23:26, UPDATE, 2 available updates (2 security updates)
11