kazulog@sv1:~$ cat /etc/os-release | head -2
PRETTY_NAME="Ubuntu 26.04 LTS"
NAME="Ubuntu"
kazulog@sv1:~$ ls -l /etc/systemd/system/hello-socket.socket /etc/systemd/system/hello-socket@.service
-rw-r--r-- 1 root root 125 Sep 12 09:48 /etc/systemd/system/hello-socket.socket
-rw-r--r-- 1 root root 127 Sep 12 09:48 /etc/systemd/system/hello-socket@.service
kazulog@sv1:~$ cat /etc/systemd/system/hello-socket.socket
[Unit]
Description=hello service socket (systemd)

[Socket]
ListenStream=10014
Accept=yes

[Install]
WantedBy=sockets.target
kazulog@sv1:~$ cat /etc/systemd/system/hello-socket@.service
[Unit]
Description=hello service (systemd socket activation)

[Service]
ExecStart=/usr/local/bin/hello.sh
StandardInput=socket
kazulog@sv1:~$ systemctl is-active hello-socket.socket
active
kazulog@sv1:~$ sudo ss -tlnp 'sport = :10014'
State               Recv-Q              Send-Q                             Local Address:Port                              Peer Address:Port              Process
LISTEN              0                   4096                                           *:10014                                        *:*                  users:(("systemd",pid=1,fd=79))