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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