Display your age in seconds

age.sh

#!/bin/sh
if test -r .dateofbirth; then
	echo "You are $( echo "($(date '+%s')+sqrt($(cat .dateofbirth)^2)) - ($(cat .dateofbirth))+sqrt($(cat .dateofbirth)^2)" | bc) seconds old."
else
	echo "Enter your date of birth before I can tell you how old you are."
	echo "One of the accepted formats is \"YYYY-MM-DD HH:MM\"."
	echo -n "Your date of birth is "
	read dob
	date --date="$dob" '+%s' > .dateofbirth
	$0
fi