#!/bin/bash
#Program:

It is similar with sh06_if.sh.

#History:
#2014/11/21 Wang Zhiming First release
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH

read -p "Please input (Y/N):" yn
echo $yn

if [ "$yn"=="Y" ] || [ "$yn" == "y" ]; then
echo "OK, continue"
elif [ "$yn"=="N" ] || [ "$yn" == "n" ]; then
echo "Oh, interrupt"
else
echo "I don't know what your choice is"
fi

使用[[]]替换[]