Show star sign by entering birth date.

star_sign.sh

#!/bin/bash
# Show user's star sign by entering birth date.
# 2013/11/19 Jason YiZhang Chen

PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH

STAR_SIGN=(Capricorn Aquarius Pisces Aries Taurus Gemini Cancer Leo Virgo Libra Scorpio Sagittarius Capricorn)
STAR_SIGN_DATE=(001 019 020 049 050 079 080 109 110 140 141 172 173 203 204 234 235 265 266 296 297 326 327 355 356 365)

read -p "Enter your birth date (ex: 01/20):" userDate
userDate=$(date -d $userDate +%j)

for (( i = 0; i <= ${#STAR_SIGN_DATE[*]} - 1; i = $i + 2 )); do
	if [[ 10#${STAR_SIGN_DATE[ $i ]} -le 10#$userDate && 10#$userDate -le 10#${STAR_SIGN_DATE[ $i+1 ]} ]]; then
		echo "Your star sign is" ${STAR_SIGN[ $i/2 ]}
		exit 0;
	fi
done