Show Listener Processes with Detailed Arguments, using `ss` instead of `netstat`

ShowListeners.sh

#!/bin/bash

# © 2026, Pandu POLUAN
# SPDX-License-Identifier: MPL-2.0

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at https://mozilla.org/MPL/2.0/.

function show_listeners() {
	ss -tulpn |
	awk '
		BEGIN { print "Proto", "IP:Port", "PID", "@@CmdLine" }
		match($7, /,pid=([0-9]+)/, ary) { print $1, $5, ary[1], "@@" ary[1] }
	' |
	column -t |
	(
		while read -r ln; do
			elems=($ln)
			pid="${elems[3]/@@/}"
			echo -n "${ln%%@@*}"
			if [[ $pid = CmdLine ]]; then
				echo "CmdLine"
				continue
			fi
			readarray -d $'\0' cmd < /proc/$pid/cmdline
			echo "${cmd[*]}"
		done
	)
}

show_listeners