You can also make a systemd service.

nano /etc/systemd/system/seed.service

put this in, customize where needed:

[Unit]
Description=COIN dns seeder
After=network.target

[Service]
WorkingDirectory=//coin-seeder
ExecStart=//coin-seeder/dnsseed -h -n -m email@mail.com
Restart=on-failure
RestartSec=10
User=root
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=COIN-seeder

[Install]
WantedBy=multi-user.target

save & exit
systemctl daemon-reload
systemctl enable seed
systemctl start seed