Check whether anything is listening on a port with unix11.12.25

example port 15656 use the Socket Statistics tool ss
```
ss -ltnp | grep 15656
```

Display All Sockets:
        ss -a or ss --all: Shows both listening and non-listening sockets [1][4].
    Filter by Protocol:
        ss -t or ss --tcp: Displays only TCP sockets [1][2][4].
        ss -u or ss --udp: Displays only UDP sockets [1][2][4].
        ss -x or ss --unix: Displays Unix domain sockets [1][4].
        ss -w or ss --raw: Displays RAW sockets [1][4].
    Display Listening Sockets:
        ss -l or ss --listening: Shows only sockets in the listening state [1][2][4].
    Display Established Connections:
        ss -t state established: Lists all established TCP connections [5].
    Show Process Information:
        ss -p or ss --processes: Displays the process ID (PID) and process name associated with each socket [1][4][5]. This is crucial for identifying which application is using a particular connection [5].
        ss -tp: Combines TCP sockets with process information [5].
    Show Numerical Addresses and Ports:
        ss -n or ss --numeric: Prevents ss from trying to resolve service names, showing exact port numbers instead [1][6].
    Show Timer Information:
        ss -o or ss --options: Displays timer information for sockets, useful for diagnosing connection issues [1][4].
    Show Detailed Socket Information:
        ss -e or ss --extended: Provides extended details, such as user ID, inode number, and socket UUID [1][2][4].
    Show Socket Memory Usage:
        ss -m or ss --memory: Displays memory usage statistics for sockets [1][5].
    Display Summary Statistics:
        ss -s or ss --summary: Provides a summarized overview of socket types and their counts, which is more efficient than parsing large socket lists [1][2][4].
    Filter by IP Version:
        ss -4 or ss --ipv4: Displays only IPv4 sockets [1][4].
        ss -6 or ss --ipv6: Displays only IPv6 sockets [1][4].
    Filter by State:
        ss -t state fin-wait-1: Filters TCP sockets by specific states like fin-wait-1 [1]. Other states include syn-sent, syn-recv, time-wait, closed, close-wait, last-ack, and closing [1].
    Filter by Port or Address:
        ss dst :80: Filters connections where the destination port is 80 [2].
        ss src 192.168.1.100: Filters connections where the source IP address is 192.168.1.100 [4].
        ss -o state established '( dport = :ssh or sport = :ssh )': Displays established SSH connections [1].

https://man7.org/linux/man-pages/man8/ss.8.html

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Check whether anything is listening on a port with unix11.12.25

Information Epoch 1768663382