systemd-ac-power

Report whether the computer is connected to an external power source. More information: https://www.freedesktop.org/software/systemd/man/systemd-ac-power.html.

• Silently check and return a 0 status code when running on AC power, and a non-zero code otherwise:

systemd-ac-power

• Additionally print yes or no to stdout:

systemd-ac-power --verbose