#!/bin/sh
#for循環最基本的用法
for var in "hello" "xiao ta" "welcome to www.49028c.com"
do
echo -n "$var "
done
echo
#通配符擴展
for var in $(ls *.sh)
do
echo "$var"
done

#while循環，后邊和if一樣跟的都是條件
echo "please input secret"
read secret
while [ "$secret" != "xiao ta" ]
do
echo "try again"
read secret
done

#until循環和while相反，條件為假才執行
echo "please input text"
read text
until [ "$text" = "xiao ta" ]
do
echo "try again"
read text
done

exit 0