[Unit]
Description=Come one step closer
After=network-online.target
Requires=network-online.target

[Service]
User=test1
Group=test1
Type=simple
ExecStart=/usr/bin/bash /absolute/path/to/test.sh

[Install]
WantedBy=multi-user.target

$ sudo systemctl daemon-reload

$ sudo systemctl start tester.service

$ sudo useradd -r -s /usr/bin/bash test1 -U