特定模式匹配后插入文件内容 [英] Insert contents of a file after specific pattern match
问题描述
我想以特定的模式匹配插入文件内容.下面是一个示例:在<tag>和</tag>之间的file1.txt中添加file2.txt内容.
I want to insert file content at specific pattern match. The following is an example: add file2.txt content in file1.txt between <tag> and </tag>.
file1.txt
<html>
<body>
<tag>
</tag>
</body>
</html>
file2.txt
Hello world!!
我尝试了以下操作，但没有成功.
I have tried following and it didn't work.
# sed "/\<tag\>/ {
h
r file2.txt
g
N
}" file1.txt
<html>
<body>
Hello World!!
<tag>
</tag>
</body>
</html>
推荐答案
尝试以下命令:
sed '/<tag>/ r file2.txt' file1.txt
它产生:
<html>
<body>
<tag>
Hello world
</tag>
</body>
</html>
编辑解释为什么命令无法按您的期望运行:r filename命令在当前循环的末尾或读取下一个输入行时添加其内容.而且您正在使用N命令，该命令不会打印任何内容，但会读取下一行，因此在那时打印Hello world并在此之后显示正常的行流.
EDIT for explanation why your command doesn't work as you want: The r filename command adds its content at the end of the current cycle or when next input line is read. And you are using the N command which doesn't print anything but reads next line, so at that time Hello world is printed and after that the normal stream of lines.
在我的情况下，它读取<tag>行，然后结束循环，因此打印该行，并在其后打印文件的内容，并继续读取直到结尾.
In my case, it reads line with <tag>, then ends cycle, so prints the line and after it the content of the file and carry on reading until the end.
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