su和sudo

一 su命令：

(1)功能：change user ID or become superuser。

二 sudo命令:

(1)功能：execute a command as another user.

*sudo allows a permitted user to execute a command as the superuser or another user, as specified in the sudoers file.

(2)常用选项：

*-S：causes sudo to read password from stdin instead of the terminal device.The password must be followed by a newline character.

(3)相关文件：

*/etc/sudoers。