secret-pw.sh

BASH Shell 编程 经典教程 《高级SHELL脚本编程》中文版

#!/bin/bash
# secret-pw.sh: 保护密码不被显示

echo
echo -n "Enter password "
read passwd
echo "password is $passwd"
echo -n "If someone had been looking over your shoulder, "
echo "your password would have been compromised."

echo && echo  # 在一个"与列表"中产生两个换行. 


stty -echo    # 关闭屏幕的echo. 

echo -n "Enter password again "
read passwd
echo
echo "password is $passwd"
echo

stty echo     # 恢复屏幕的echo. 

exit 0

# 详细的阅读stty命令的info页, 以便于更好的掌握这个有用并且狡猾的工具.