Shell的条件表达式介绍
#!/bin/shsum=1000
i=500
method(){
read -p "please input msg:" TXT
read -p "send msg,are you sure?" select
case "$select" in
y)
((sum=sum-i))
echo "send $TXT is ok!"
echo "you have $sum money!"
;;
n)
echo "you select can't send msg!"
echo "you have $sum money!"
exit 1
;;
*)
echo "USAGE: please input !"
exit 2
esac
}
#判断是否为int
judge(){
expr $1 + 1 &>/dev/null
#这里有个小问题,如果充值负数也可以...知道的,请赐教...谢谢
if [ $? -ne 0 -a "$1" != "-1" ];then
echo "INVALID INPUT!"
exit 8
else
return 0
fi
}
while true
do
if[ $sum -ge $i ];then
method
else
read -p "您的余额不足,是否需要充值?" select2
case "$select2" in
y)
read -p "How much do you want to recharge:" add
judge $add
((sum=sum+${add}))
echo "pay successful! The balance is ${sum} !"
read -p "Whether to continue texting?" msg
case "$msg" in
y)
while [ $sum -ge $i ]
do
method
done
continue
;;
n)
echo "即将退出!感谢使用!"
exit 6
;;
*)
echo "USAGE:您的输入有误!"
exit 5
esac
;;
n)
echo "you only $sum money!Can't send msg!"
exit 3
;;
*)
echo "USAGE: without the select!"
exit 4
esac
break
fi
done
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