systemd-ac-power

Check AC power status

$ systemd-ac-power

$ systemd-ac-power -v

systemd-ac-power [OPTIONS]

systemd-ac-power reports whether the computer is connected to an external power source (AC mains). It returns exit code 0 when on AC power and non-zero when on battery.
This is useful in scripts and systemd unit conditions to change behavior based on power state.

-v, --verbose

Print "yes" or "no" to stdout in addition to exit code

Display help

0 - Running on AC power
non-zero - Running on battery or unable to determine

Requires proper power supply detection by the kernel. Some desktop systems without batteries always report AC power. Virtual machines may report power state incorrectly.

systemd-ac-power provides a simple, scriptable interface to power supply status, enabling power-aware behavior in systemd units and shell scripts.

systemctl(1), upower(1)