Run a daemonized process in the "foreground", sort of

forwardize.sh

#!/bin/sh
#
# I found the original version of this on stackexchange but forget where.
#

set -eu

pidfile="$1"
cmdline="$2"

# Trap and proxy the signals :)
function kill_app() {
	kill $(cat $pidfile)
	exit 0
}
trap "kill_app" SIGINT SIGTERM

# Launch the daemon
${cmdline}
sleep 2

# Wait for the daemon to exit
while [ -f ${pidfile} ] && kill -0 $(cat $pidfile) ; do
	sleep 0.5
done

# unexpected exit
exit 1000