video on demandcreate a service file.
cp /lib/systemd/system/crond.service \ /lib/systemd/system/sleep.service
edit the service file.
vi /lib/systemd/system/sleep.service
[Unit]
Description=sleep service
[Service]
ExecStart=/usr/sbin/sleep.sh
KillMode=process
[Install]
WantedBy=multi-user.target
create a script to be executed.
vi /usr/sbin/sleep.sh
#!/usr/bin/bash
sleep 1000
make the script executable
chmod +x /usr/sbin/sleep.sh
enable the service.
systemctl enable sleep.service
start the service.
systemctl start sleep.service
check status.
systemctl status sleep.service