BT Shell - Số 11

#!/bin/bash
# Author : Quach CHi Cuong
# Website: https://cuongquach.com/
# Excersie 11 : https://cuongquach.com/shell-nhap-ten-tuoi-xuat-nam-100-tuoi.html


read -p "- Ten ban la gi : " NAME
read -p "- Ban bao nhieu tuoi : " AGE

if [ -z "${NAME}" ];then
	echo "- Ban chua nhap ten. Thoat."
	exit 1
fi

if [ -z ${AGE} ];then
	echo "- Ban chua nhap tuoi. Thoat"
	exit 1
elif [ ${AGE} -lt 0 ];then
	echo "- Tuoi cua ban khong the nho hon 0. Thoat"
	exit 1
fi

CURRENT_YEAR="2017"
AGE_100=$(expr ${CURRENT_YEAR} - ${AGE} + 100)
AGE_80=$(expr ${CURRENT_YEAR} - ${AGE} + 80)
AGE_60=$(expr ${CURRENT_YEAR} - ${AGE} + 60)

echo ""
echo "-+ Ban se 60 tuoi vao nam : ${AGE_60}"
echo "-+ Ban se 60 tuoi vao nam : ${AGE_80}"
echo "-+ Ban se 60 tuoi vao nam : ${AGE_100}"

exit 0