```
[Unit]
Description=ngrokd server

[Service]
Type=simple
User=ngrok
Group=ngrok
ExecStart=/bin/sh -c '/usr/local/ngrok/bin/ngrokd \
 -tlsCrt /usr/local/ngrok/tls/srv-ngrok.cert \
 -tlsKey /usr/local/ngrok/tls/srv-ngrok.key \
 -domain="ioio.cool" \
 -httpAddr=:8480 \
 -httpsAddr=:8433 \
 -tunnelAddr=:8422 >> /var/log/ngrokd.log 2>&1'
Restart=always
KillMode=process

[Install]
WantedBy=multi-user.target
```

You can see `man systemd.exec`, search keywords `StandardOutput`, and `man systemd.service`, serach keywords `COMMAND LINES`

> This syntax is intended to be very similar to shell syntax, but only the meta-characters and expansions described in the following paragraphs are understood.
 Specifically, redirection using "<", "<<", ">", and ">>", pipes using "|", running programs in the background using "&", and other elements of shell syntax are not
 supported.