使用awk搜索模式并从日志文件中打印下15行 [英] Searching a pattern using awk and print next 15 lines from a log file

问题描述

使用awk搜索模式并从日志文件中打印下15行

Searching a pattern using awk and print next 15 lines from a log file

awk '/^DERAT1SB[0-9][0-9]# show registration/{nr[NR]; nr[NR+4]}; NR in nr' slb.log

我正在使用上述命令在日志文件中搜索模式DERAT1SB23# show registration，但是它抛出语法错误.

I am using above command to search a pattern DERAT1SB23# show registration inside a log file, but it is throwing a syntax error.

错误:

awk: syntax error near line 1

awk: bailing out near line 1

推荐答案

来自 有效的Awk编程，第4版 :

其他名字的玫瑰 awk语言已经发展了多年.完整的详细信息请参见附录A [ [awk语言]，第439页.本书中所描述的语言通常是 称为新awk".以此类推，awk的原始版本是 称为旧awk".

A Rose by Any Other Name The awk language has evolved over the years. Full details are provided in Appendix A [The Evolution of the awk Language], page 439. The language described in this book is often referred to as "new awk." By analogy, the original version of awk is referred to as "old awk."

在大多数当前系统上，当您运行 awk实用程序，您会获得一些新版本的awk. ⁴ 如果您的系统是 标准awk是旧的awk，如果您看到 尝试测试程序:

On most current systems, when you run the awk utility you get some version of new awk.⁴ If your system’s standard awk is the old one, you will see something like this if you try the test program:

$ awk 1 /dev/null
error awk: syntax error near line 1
error awk: bailing out near line 1

在这种情况下，您 应该找到新awk的版本，或者只是安装gawk！

In this case, you should find a version of new awk, or just install gawk!

穿越 这本书，每当我们提到语言功能时， 在POSIX awk的任何完整实现中都可用，我们只需使用 术语awk.当指代特定于GNU的功能时 实施中，我们使用术语gawk.

Throughout this book, whenever we refer to a language feature that should be available in any complete implementation of POSIX awk, we simply use the term awk. When referring to a feature that is specific to the GNU implementation, we use the term gawk.

⁴ 仅Solaris系统仍将旧的awk用于默认的awk实用程序.在这些系统上的/usr/xpg6/bin中居住着更现代的awk.

⁴ Only Solaris systems still use an old awk for > the default awk utility. A more modern awk lives in /usr/xpg6/bin on these systems.

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