这个脚本提供了一种理想的方式，它允许特定用户telnet或ssh到您的系统中，但不允许这个用户从命令行建立任何新的外出连接。
This script provides an ideal way to allow a particular user to Telnet or SSH into your system, yet not allow this user to establish any new outgoing connections from the command-line.
设想这样的情况：你外出的时候拍下照片，然后把相机带回家，连接到你的计算机上。
The idea is that you’ll go out, take your pictures and then bring your camera home to hook it up to your computer.
设想这样的情况：你外出的时候拍下照片，然后把相机带回家，连接到你的计算机上。
The idea is that you'll go out, take your pictures and then bring your camera home to hook it up to your computer.
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