首先看实例代码：
#/bin/bash
cal
date -u
echo "Hello,welcome ${LOGNAME}！A full day has begun!"
read -p "input your pass word!" pwd
if test $pwd == "123"
then
echo "Your login sucessfully!"
for file in /tmp/*
do
echo $file
done
else
echo "Deny logon"
fi
cal 打印日历
date -u 显示或设置全球时间(格林威治时间)
${LOGNAME}当前登录用户
以上实例非常简单，大家可以尝试测试下，感谢大家的学习和对的支持。