Show HN: Sonar – A tiny CLI to see and kill whatever's running on localhost (github.com)

So I built this lightweight CLI. Single binary, no dependencies. It shows everything listening on localhost with process names, Docker container info, clickable URLs etc.

Sure there are workarounds, but none that satisfied my need for a short, easily rememberable command. Also nothing really has the same satisfaction as running sonar kill 3000 — it just feels nice. I’ve already been approached by a few agent orchestration tools that have been struggling with the same thing. It's really useful when you have multiple agents running, but it's not built for just that use case, I have also find it handy when killing off all containers after a failed cleanup and so on. Also know that MCPs are dead and CLIs are the new thing in agentic coding, this might be a useful tool for Claude, particularly when a compose process exits before all containers are stopped.

Open for contributions, ideas and feedback.

So why doesn't everyone run local services over Unix sockets?

The only problems: 1) web browsers don't support AF_UNIX URI scheme, and 2) ancient versions of Java don't have built-in APIs for AF_UNIX sockets.

That's it. For these trivial reasons, we've beat our head against arbitrary opaque numbers for decades.

And so, for want of a nail, the Unix was lost.

I like clack/prompts. See its multiselect API.

https://github.com/bombshell-dev/clack/tree/main/packages/pr...

    3000    wud (getwud/wud:latest)                            wud          getwud/wud:latest                       3000    http://localhost:3000
    3001    dockhand (fnsys/dockhand:latest)                   dockhand     fnsys/dockhand:latest                   3000    http://localhost:3001

  lk() {
    if [ $# -eq 0 ]; then
        local output=$(sudo lsof -iTCP -sTCP:LISTEN -n -P)
    elif [ $# -eq 1 ]; then
        local output=$(sudo lsof -iTCP -sTCP:LISTEN -n -P | grep -i --color=always $1)
    else
        echo "find and kill processes listening on ports. Usage: lk [pattern]"
        return 1
    fi

    if [ -z "$output" ]; then
        echo "No listening processes found."
        return 0
    fi

    # Show header + results
    echo "$(sudo lsof -iTCP -sTCP:LISTEN -n -P | head -1)"
    echo "$output"
    echo ""

    # Extract unique PIDs (skip the header row if no grep was applied)
    local pids=($(echo "$output" | awk '{print $2}' | grep -E '^[0-9]+$' | sort -u))

    if [ ${#pids[@]} -eq 0 ]; then
        echo "No PIDs found."
        return 0
    fi

    echo "PIDs to kill: ${pids[*]}"
    echo -n "Kill these ${#pids[@]} process(es)? [y/N] "
    read -r confirm

    if [[ "$confirm" =~ ^[Yy]$ ]]; then
        for pid in "${pids[@]}"; do
            echo "Killing PID $pid..."
            sudo kill -9 $pid
        done
        echo "Done."
    else
        echo "Aborted."
    fi
  }

https://github.com/fcoury/sonars

I have a tiny shell function to kill whatever is listening on that port

https://github.com/clutchski/dotfiles/blob/main/home/bin/por...

For the even less patient there's also this (not mine): https://github.com/jkfran/killport