systemctl - 1.4.4181-1.1 main

"systemctl" is a replacement command to control system daemons without
systemd. "systemctl" is useful in application containers where systemd is
not available to start/stop services.
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This script can also be run as init of an application container (i.e. the
main "CMD" on PID 1) where it will automatically bring up all enabled
services in the "multi-user.target" and where it will reap all zombies
from background processes in the container. When stopping such a container
it will also bring down all configured services correctly before exit.