systemd-ac-power — Report whether we are connected to an external power source
systemd-ac-power may be used to check whether the system
is running on AC power or not. By default it will simply return success (if we
can detect that we are running on AC power) or failure, with no output.
This can be useful for example to debug
The following options are understood:
Show result as text instead of just returning success or failure.
Instead of showing AC power state, show low battery state. In this case will return zero if all batteries are currently discharging and below 5% of maximum charge. Returns non-zero otherwise.
On success (running on AC power), 0 is returned, a non-zero failure code otherwise.