SED：在某个位置插入一行 [英] sed: insert a line in a certain position

问题描述

我只是环顾四周，但我没有发现任何对我的作品。
我想在其他行的上方插入新行（基本上是一个HTML表行）。

i was just looking around but i didn't find anything that works for me. I would like to insert a new line (basically an html table row) on top of the other rows.

<table id="tfhover" class="tftable" border="1">
<tr><th>HEADER1</th><th>HEADER2</th><th>HEADER3</th><th>HEADER4</th></tr>
<tr><td>Row:1 Cell:1</td><td>Row:1 Cell:2</td><td>Row:1 Cell:3</td><td>Row:1 Cell:4</td></tr>
</table>

那么，有没有任何人可以建议我一个sed CMD，将插入一个新的：

So, is there anyone that can suggest me a sed cmd that will insert a new:

<tr><td>Row:1 Cell:1</td><td>Row:1 Cell:2</td><td>Row:1 Cell:3</td><td>Row:1 Cell:4</td>

只是标题下面？

谢谢！

推荐答案

因此​​，对于一开始，我们有以下行，称为文件 datafile.txt

So for the start, we have a file with the following lines, called datafile.txt

1 some test lines here
but not all lines contain nubers
3 and here is the last one

和我们有一个bash的变量 $ ADDED 什么要添加的行内容

and we have one bash variable $ADDED with the line content what want add

ADDED="==This is the new line=="

所以，第一行后添加行

ADDED="==This is the new line=="
< datafile.txt sed "1a \\
$ADDED
"

结果：

1 some test lines here
==This is the new line==
but not all lines contain nubers
3 and here is the last line

什么是数字开始的所有行后添加行

< datafile.txt sed "/^[0-9]/a \\
$ADDED
"

结果：

1 some test lines here
==This is the new line==
but not all lines contain nubers
3 and here is the last line
==This is the new line==

添加行的开始，所以插入第一行之前

< datafile.txt sed "1i \\
$ADDED
"

结果

==This is the new line==
1 some test lines here
but not all lines contain nubers
3 and here is the last line

您可以替代行了添加一个新的结束

< datafile.txt sed "/all/s/$/\\
$ADDED/"

上面的例子中包含什么字行之后添加行都通过置换

the above example add line after the line what contains word "all" by substitution

1 some test lines here
but not all lines contain nubers
==This is the new line==
3 and here is the last line

你甚至可以分割线和

之间添加

< datafile.txt sed "/all/s/\(.*lines \)\(.*\)/\1\\
$ADDED\\
\2/"

以上会搜索什么包含了所有一词，并在线后，分割线。其结果是：

the above will search for the line what contains the word "all" and split it after the word "lines". The result:

1 some test lines here
but not all lines 
==This is the new line==
contain nubers
3 and here is the last line

最后一件事。这是不可能的解析 HTML与regural前pressions，检查人造卫星的评论的链接。

Last thing. It is impossible to parsing HTML with regural expressions, check the link in sputnik's comment.

但是，这并不意味着比这是不可能的匹配的HTML文件的某些部分。如果你知道你想要什么的匹配（而不是解析） - 你可以放心地使用常规的前pression为HTML了。简单地说，许多人在这里不知道解析和匹配之间的区别。

BUT, that's not mean than it is impossible match some parts of HTML files. If you know what you want match (and not parse) - you can safely use regular expression for HTML too. Simply, many peoples here don't know the difference between parsing and matching.

所以，如果你的HTML文件已众所周知的结构，例如您的确定的比你的HTML将上述结构中的所有时间，你可以放心地写：

So, if your html files has well known structure, e.g. you are sure than your html will the above structure all times, you can safely write:

<your_file.html sed "/^<tr><th>/a \\
<tr><td>new Row:1 Cell:1</td><td>Row:1 Cell:2</td><td>Row:1 Cell:3</td><td>Row:1 Cell:4</td>
"

和您将获得

<table id="tfhover" class="tftable" border="1">
<tr><th>HEADER1</th><th>HEADER2</th><th>HEADER3</th><th>HEADER4</th></tr>
<tr><td>new Row:1 Cell:1</td><td>Row:1 Cell:2</td><td>Row:1 Cell:3</td><td>Row:1 Cell:4</td>
<tr><td>Row:1 Cell:1</td><td>Row:1 Cell:2</td><td>Row:1 Cell:3</td><td>Row:1 Cell:4</td></tr>
</table>

只是因为我们的不解析的的HTML code，我们只的匹配的一些线条图案。

simply because we NOT PARSING the html code, we are only MATCHING some line patterns..

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