直接上代码
#!/bin/bash
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH
read -p "input (Y|N):" yn
if [ "$yn" == "Y" ] || [ "$yn" == "y" ] ; then
echo "OK.good "
exit 0
fi
if [ "$yn" == "N" ] || [ "$yn" == "n" ] ; then
echo "no,it's bad "
exit 0
fi
echo "i don't know what choice on you" && exit 0
#错误信息
#sh06-2.sh: 7: [: n: unexpected operator
#sh06-2.sh: 7: [: n: unexpected operator
#sh06-2.sh: 12: [: n: unexpected operator
#sh06-2.sh: 12: [: n: unexpected operator
#i don't know what choice on you
我输入的是 n