如何使用sed仅在包含另一个图案线来替换在文件中的图案 [英] How to use sed to replace a pattern in a file only in lines that contain another pattern

问题描述

在我的具体情况，我需要遍历包含存储URL的变量几百个文件。所有网址都不同，但对于这个例子来说，我们可以假设他们与所有终端COM

In my specific situation, I need to loop through several hundred files that contain a variable which stores a URL. All of the URLs are different, but for the sake of this example we can assume they all end with 'com"'

我需要添加一些文字，立即COM以下

I need to add some text immediately following the com

由于所有的URL都会有不同的领域，我不能用一个sed命令，如：

Because all of the URLs will have different domains I cannot use a sed command like:

SED -iS / ^环境=someurl.com/环境=someurl.com.origin.net/ G'

由于该文件包含其中可能包含COM其他行，我不能用这样的：

Because the files contain other lines which may contain com, I cannot use something like:

SED -i的/ COM / com.origin.net / G'

我需要这样做的搜索，只有在包含模式，如下面的正则表达式我的例子中的某一行替换：

I need to do this search and replace only on a specific line containing a pattern, such as from my example below in regex:

^环境。*

如果我能集中使用的sed只匹配上面的图案，然后我可以使用的sed如SED -i 的/ COM / com.origin.net /一些改编行G'。当然，我可以写一个过于复杂的bash脚本来做到这一点，但我知道有一个很好的单行方式告诉SED找到一个模式，仅在图案中发现的线上工作，以及搜索和替换另一种模式有一个新的字符串。

If I could focus the use of sed only to the line that matched the above pattern then I could use some adaptation of sed such as sed -i 's/com/com.origin.net/g'. I could of course write an overly complicated bash script to do this, but I know there is a nice one liner way to tell sed to find a pattern, only work on the line that the pattern is found in, and search and replace another pattern with a new string.

在谷歌搜索中，只是半相关的链接，我发现这个是：

<一个href=\"http://unix.stackexchange.com/questions/37518/how-to-sed-only-that-lines-that-contains-given-string\">http://unix.stackexchange.com/questions/37518/how-to-sed-only-that-lines-that-contains-given-string

In searching Google, the only semi relevant link I found about this was:

http://unix.stackexchange.com/questions/37518/how-to-sed-only-that-lines-that-contains-given-string

但它没有充分回答我的问题。也能够约束的sed匹配一个很好的工具将模式添加到我的sed阿森纳一般只是一条线。

but it didn't sufficiently answer my question. Also being able to constrain sed in general to just a line that matches a pattern would by a nice tool to add to me sed arsenal.

任何帮助，导致这里的解决方案将是非常美联社preciated。

Any help that leads to solution here will be very appreciated.

下面是一个文件的一个例子

Here is an example of a file

###示例文件

  ＃

  ＃

  ＃someurl.com

  

  环境=someurl.com

### Example File
#
#
# someurl.com

ENVIRONMENT="someurl.com"

我要替换的环境=someurl.com'环境=someurl.com.orign.net

I want to replace 'ENVIRONMENT="someurl.com"' with 'ENVIRONMENT="someurl.com.orign.net"'

我可能会插入来自这个职位在同一行的shell脚本来源，如sed命令：

I would probably insert the sed command derived from this post in one line shell script such as:

`中的* .config F; DO File2BeEdited = $（猫$ F | grep的^ PatternToIdentifyLine | grep的-v RemoveLinesThatAreAlreadyCorrect）;如果[$ File2BeEdited=！;然后RunSedCommand; printf的\\ N实测值需要被编辑的文件\\ N运行的sed在$ F >> log.log。做

`for f in *.config; do File2BeEdited=$(cat $f | grep ^PatternToIdentifyLine | grep -v RemoveLinesThatAreAlreadyCorrect); if [ "$File2BeEdited" != "" ];then RunSedCommand; printf "\nFound a file that needs to be edited.\nRunning sed on $f >> log.log"; done

所以，我可以遍历目录中的每个配置文件，并选择性地进行更改

So I could loop through every configuration file in a directory and selectively make this change

推荐答案

下面的命令行显示了两种可能的解决方案：可以限制更换某些线路与 /正则表达式/ 。你也可以使用替代与匹配的文本\\ 0 ， \\ 1 等

The following command line shows two possible solutions: You can restrict the replacement to certain lines with /regex/. And you can use the matched text in replacements with \0, \1, etc.

sed -e '/^\(ENVIRONMENT="[^"]*\.com\)"/s//\1.origin.net"/'

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