systemd.service tutorial
Source: http://unix.stackexchange.com/a/47715
Create /etc/systemd/system/my_service.service (copy structure from existing file)
[Unit]
description=Mi servicio
[Service]
Type=oneshot
ExecStart=/bin/bash -c "bla bla bla"
[Install]
WantedBy=multi-user.target
Enable new service
systemctl enable my_service
To execute bash command directly:
/bin/bash -c "<bash comand>"