Power-source detection
The guard reads Linux power-supply data for mains, USB, USB-C, USB-PD, and battery charging or full states instead of relying on a single adapter name.
Linux laptop servers
Let the battery protect your data
Power Outage Helper watches incoming power and network reachability. If both remain unavailable after a grace period, it starts a normal Linux shutdown before the laptop battery is exhausted.
Two signals before shutdown
Careful decisions during an outage
Redundant network checks
After power is absent for 30 seconds, shutdown proceeds only if google.com, 1.1.1.1, and the local gateway at 192.168.1.1 are all unreachable.
Managed system service
One script installs, starts, checks, and removes a systemd service. The service restarts automatically and records events through the system logger.
Install with systemd
Start protecting the server
The installer copies the guard to /usr/local/sbin, creates the systemd unit, and enables it immediately. Root access and the ping command from iputils-ping are required.
chmod +x power-network-shutdown-guard.sh
sudo ./power-network-shutdown-guard.sh --install
sudo ./power-network-shutdown-guard.sh --status-
1
Test adapter detectionRun the non-destructive test helper and unplug the adapter. It exits when incoming power is no longer detected.
-
2
Install the guardMake the shutdown script executable and run its install command with root privileges.
-
3
Verify the serviceCheck systemd status and confirm that the three default ping targets reflect the server's actual network.
Non-destructive verification
Test detection before enabling shutdown
The adapter test polls every two seconds and never shuts down the machine. Use it first to confirm that the laptop exposes its charging state through /sys/class/power_supply.