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447 B

#!/usr/bin/env sh
TIME=$(
echo "$@" |
sed 's#h#*60m#g'|
sed 's#m#*60s#g'|
sed 's#s#*1#g'|
sed 's# #+#g' |
bc
)
date1=$((`date +%s` + $TIME));
while [ "$date1" -ge `date +%s` ]; do
echo -ne "$(date -u --date @$(($date1 - `date +%s`)) +%H:%M:%S) \r";
sleep 0.1
done
echo "Done with $@"
while :;
do notify-send "Done with $@";
xset dpms force off
xset dpms force on
sleep 0.5
done