shell 循环语句学习笔记 shell脚本编程之循环语句学习笔记

#!/bin/sh
#for循环最基本的用法
for var in "hello" "xiao ta" "welcome to www.qb5200.com"
do
echo -n "$var "
done
echo
#通配符扩展
for var in $(ls *.sh)
do
echo "$var"
done

#while循环，后边和if一样跟的都是条件
echo "please input secret"
read secret
while [ "$secret" != "xiao ta" ]
do
echo "try again"
read secret
done

#until循环和while相反，条件为假才执行
echo "please input text"
read text
until [ "$text" = "xiao ta" ]
do
echo "try again"
read text
done

exit 0