#!/bin/bash

set -ue

get_parent () {
	ps hoppid p$1
}

get_children () {
	ps hopid --ppid "$1"
}

get_ancestors () {
	case $1 in
		0|1|'')	:
	;;	*)	get_ancestors $(get_parent $1)
	esac
	echo "$1"
}

get_descendents () {
	for c in $(get_children "$1")
	do	echo "$c"
		get_descendents "$c"
	done
}

declare -i p
for p in "$@"
do	
	[[ $p -ne 0 ]] && {
		get_ancestors "$p"
		get_descendents "$p"
	} | {
		readarray -t pids
		ps -Hf "${pids[@]}" | sed "/^[^ ]* *$p /s/.*/&/"
	}
done