grep

Using grep in many cases can give you the desired value .

在许多情况下使用grep可以得到需要的值。

Note that this is not regular expression matching as used by grep .

注意：这不是grep使用的正则表达式匹配。

The grep utility filters input line by line and looks for matches .

grep实用工具逐行过滤输入并寻找匹配。

Listing 12 shows some of the basic regular expressions used with the grep command .

清单12显示了与grep命令一起使用的一些基本正则表达式。

Here are a few examples of regular expressions using grep as the search tool .

以下是一些使用grep作为搜索工具的正则表达式示例。

Using the grep command , you can filter the result and retrieve just the parameters you want

通过使用grep命令，可以过滤结果，只获取想要的参数

You can use the grep utility to search the system user attribute defaults in the file .

可以使用grep工具在文件中搜索系统用户属性默认值。

The second important note about this example is that you 've performed the grep operation remotely .

关于这个示例，第二项需要说明的重要内容是，您以远程的方式执行了grep操作。

For example , a simple grep command can help you find files that match certain search criteria .

例如，一个简单的grep命令能够帮助您找到匹配特定搜索条件的文件。

This article helps you better understand the regular expressions used by both grep and sed .

本文将帮助您更好地理解grep和sed使用的正则表达式。

A coarse tool like grep will generally find a lot of things that are not of interest .

象grep这样粗糙的工具通常会找到许多没有什么意义的事物。

So grep runs through all C files looking for the text pattern that it was given .

因此，grep检查所有C文件，查找指定的文本模式。

Just using dmesg | grep is a useful troubleshooting and system discovery tool .

只要使用dmesggrep，您会发现这是一个有用的故障检修和系统发现工具。

The fgrep utility is always much faster than grep .

fgrep工具通常速度都比grep更快。

Grep can find fixed sequences of characters and can even ignore case with the - I option .

grep可以查找具有固定顺序的字符组合，甚至可以通过使用-i选项来忽略大小写。

The second method is to use the-i option , which tells grep to ignore case sensitivity .

第二种方法是使用-i选项，这告诉grep忽略大小写的敏感性。

GNU Project Web site : Download a free copy of GNU grep for your operating system .

GNU项目网站：下载用于您的操作系统的免费GNUgrep副本。

Next , request the MapReduce job for grep .

接下来，请求用于执行grep的MapReduce作业。

For instance , I often use find in combination with grep or Perl to process a large number of files .

例如，我经常将find与grep或者Perl一起使用，以便对大量的文件进行处理。

The grep utility has other built-in options to refine searches .

grep实用工具包含其他可优化搜索的内置选项。

When combined with the grep command , I can retrieve the conditions in Buffalo .

当与grep命令组合使用时，我可以检索布法罗市的天气状况。

My first thought is that I could use simple grep commands to search for the number of quakes per day .

我第一个想到的就是使用简单的grep命令来搜索每天的地震数。

The following file , which I 'll name " memo ," illustrates grep 's usage and results .

下面这个文件我称之为“memo”，阐述了grep的用法和结果。

In its simplest use , grep prints those lines that contain text that matches a pattern .

grep的最简单应用是打印那些包含与某个模式匹配的文本的行。

If you like grep , you won 't find any more AIO servers .

如果您喜欢使用grep，那么您将无法找到更多的AIO服务器。

Run lsdev – C | grep fcs to view all Fibre Channel devices on the system .

运行lsdev–Cgrepfcs查看系统中所有FibreChannel设备。

So , when should you use find / xargs , and when should you use grep ?

那么，什么时候应该使用find/xargs，什么时候应该使用grep呢？

First , run a grep command with the-o option , if your version supports it .

首先，使用-o选项（如果您的版本支持它的话）来运行grep命令。

Execute the ps – ef | grep virtual command to list the processes containing the string virtual .

执行ps–efgrepvirtual命令来列出包含虚拟字符串的进程。

You might want to search for recently created files , or grep through the last 3 days worth of log files .

也许您想搜索最近创建的文件，或者查找近三天内的日志文件中的字符串。