Perl's regular expression heritage comes from shell scripting and the awk/ grep tools.

As mentioned earlier, this variable allows you to set the character sequence that awk expects to find between fields.

如前所述，这个变量支持设置awk期望在字段中找到的字符序列。

The tool comes with a postprocessing script that requires a UNIX shell and awk capabilities.

该工具随后处理程序脚本一起提供，该脚本需要UNIX shell和awk功能。

Awk is geared toward text processing and report generation, yet features many well-designed features that allow for serious programming.

awk适合于文本处理和报表生成，它还有许多精心设计的特性，允许进行多种方式的编程。

You should also be able to write custom AWK programs to perform complex text processing from the UNIX command line.

您还应该能够编写自定义的AWK程序，以使用UNIX命令行执行复杂的文本处理。

This tutorial provides a hands-on introduction to the AWK text-processing language.

本教程为AWK文本处理语言提供了实践性的介绍。

Normally, awk executes each block of your script's code once for each input line.

通常，awk会针对每个输入行执行一次每个代码块。

I find it more manageable to have separate awk statements for each condition I want met.

我发现，对于希望满足的每个条件，使用单独的awk语句更便于管理。

In this tutorial, you use GAWK to learn the various methods of running AWK programs.

在本教程中，您将使用GAWK，以了解各种运行AWK程序的方法。

Awk executes this block after all lines in the input file have been processed.

在输入文件的所有行处理完毕之后，awk执行这个代码块。

Take that line and use awk to print the second field, which is the total memory in the node.

获取那一行并使用awk输出第二个字段，它是节点中的总内存。

Awk has its own complement of special variables.

Awk有其自己的特殊变量集合。

Awk tests every record in the specified file ( or files) for a pattern match.

awk测试指定文件中的每个记录是否符合模式匹配。

This will also bring the report into columns where awk can then be used to extract details.

这会让报告以列的形式呈现，awk可以从这些列中提取信息。

For such situations, awk allows you to define a BEGIN block.

对这种情况，awk支持定义BEGIN代码块。

By default, awk treats each comma-separated value as a different field.

缺省情况下，awk将每个以逗号分隔的值视为不同的字段。

To ignore all records that contain the string'xnpd', one could use the following awk statement

要忽略包含字符串'xnpd'的所有记录，可以使用以下awk语句

You also see how programs are structured and learn AWK's record and field paradigm.

您还将了解如何组织程序，并学习AWK的记录和字段范例。

The awk command can be complex and used in a wide variety of situations.

awk命令可以很复杂并应用于广泛的情景中。

You can use the awk command to quickly total the sales for each month.

您可以使用awk命令来快速获得每个月的销售总额。

Listing 15 shows how to get started with the awk command.

清单15显示了如何开始使用awk命令。