#!/bin/sh

# $0 [OPTION] DURATION COMMAND [ARG]...
# DURATION with suffix: s, m, h, d
# -k --kill--after
# -s --signal
# exit: 124

set -e
set -o nounset

wrapper_pid=$$
seconds="$1"
shift
signal='TERM'

(sleep $seconds; kill $wrapper_pid) &
watchdog_pid=$!

trap "kill -$signal $watchdog_pid" EXIT

$@