换句话说，需要针对特定文档编写XPath查询，提供和元素、属性、文本比较的具体数据来使用谓词和XPath。
In other words, you construct an XPath query for a specific document, with a specific set of data that you're comparing elements, attributes, and text to using predicates and XPaths.
当在类unix的系统上编辑文本时，比较安全的方式是使用为这些工具设计的一些命令，例如sed、tr、gawk或perl。
When text editing on a Unix-like system, it is safer to use one of the many commands intended for use by programs such as sed, tr, gawk, or perl.
使用您喜欢的文本编辑器清理script输出文件比较容易，网上有各种清理脚本可用。
It's easy enough to clean up a script output file using your favorite text editor, and a variety of cleanup scripts are available on the web.
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