【shell 脚本】两种登录方式

#!/bin/bash
echo "while 方法！"

echo "请输入登录用户名："
read name1
if test $name1 = "yang"
then
  echo "登录成功"
else
  echo "登录失败，请输入正确的用户名："
  read name1
  while [ $name1 != "yang" ]
   do
      echo "登录失败，请输入正确的用户名："
      read name1
      if test $name1 = "yang"
        then
           echo "登录成功"
           break;
      fi
   done
fi

echo "until 方法！"
echo "请输入登录用户名："
read name1
if test $name1 = "yang"
then
  echo "登录成功"
else
  until [ $name1 == "yang" ]
  do
      echo "登录失败，请输入正确的用户名："
      read name1
      if test $name1 = "yang"
        then
           echo "登录成功"
           break;
      fi
  done
fi  

exit 0