delay

delay

#!/bin/bash -e
WHEN=${1}
shift
if [[ -z ${WHEN} ]]; then
	echo "Usage: ${0} <date/time format> [program]"
	exit 1
fi
TARGET=$(date -d "${WHEN}" +%s)
echo "Terminating on $(date -d "@${TARGET}")"
while :; do
	NOW=$(date +%s)
	((NOW>TARGET)) && break
	T=$((TARGET-NOW))
	: "${FMT:=%$(awk '{print length}' <<<"$((T/3600))")d:%02d:%02d}"
	printf "\rExpires in: $FMT" $((T/3600)) $((T/60%60)) $((T%60))
	sleep 1
done
echo
(($#)) && exec "$@"