sudo程序的介绍和实例！
时间：2006-08-30 来源：适兕
Sudo (superuser do) allows a system administrator to give certain users (or groups of users) the ability to run some (or all) commands as root while logging all commands and arguments. Sudo operates on a per-command basis, it is not a replacement for the shell. It's features include:The ability to restrict what commands a user may run on a per-host basis.
查看man sudo和man sudoers，请确定编辑/etc/sudoers用visudo指令。
- Sudo does copious logging of each command, providing a clear audit trail of who did what. When used in tandem with syslogd, the system log daemon, sudo can log all commands to a central host (as well as on the local host). At CU, all admins use sudo in lieu of a root shell to take advantage of this logging. Sudo uses timestamp files to implement a "ticketing" system. When a user invokes sudo and enters their password, they are granted a ticket for 5 minutes (this timeout is configurable at compile-time). Each subsequent sudo command updates the ticket for another 5 minutes. This avoids the problem of leaving a root shell where others can physically get to your keyboard. There is also an easy way for a user to remove their ticket file, useful for placing in a .logout file. Sudo's configuration file, the sudoers file, is setup in such a way that the same sudoers file may be used on many machines. This allows for central administration while keeping the flexibility to define a user's privileges on a per-host basis. Please see the samples sudoers file below for a real-world example.
Sudo is distributed under the following ISC-style license:另附/etc/sudoers配置文件，其他文档请
Copyright (c) 1994-1996,1998-2005 Todd C. Miller <[email protected]>
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