最后，如果到了这里，说明将要上载的远程目录和文件都存在。

Finally, if we've made it this far, it means the remote directory and file we're trying to upload to both exist.

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有关如何使用此工具的详细说明，可以在同一目录的README文件中找到，或者参阅在线InfoSphere Warehouse信息中心(请参见参考资料)。

Detailed instructions for how to use this utility can be found in the README file in the same directory, or in the online InfoSphere Warehouse Information Center (see Resources).

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作为说明tac的工作原理的示例，请在您的主目录中对一些文件使用ls - l | tail和ls - l | tail | tac，比较其结果。

For an example of how tac works, compare results of ls -l | tail and ls -l | tail | tac on some files in your home directory.

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