#!/bin/sh
# find first process with marker=true envvar set
set -eu
uid="${1:?}"
done=
while true; do
	for pid in $(pgrep -u ${uid}); do
		if grep -q 'marker=true' /proc/${pid}/environ 2>/dev/null; then
			printf "%s" "$pid"
			done=1
			break
		fi
	done
	[ -n "$done" ] && break
done