Shell Programming and Scripting

Hello everyone,

i wonder if someone could give me an advice regarding the following problem using sed.

Given ist a structure as shown below:
<aaa>text1<b>text2</b>text3<c>text4</c>text5</aaa>

Now I want to change the outer tag from "aaa" to "new" and replace all tags inside the outer tags using underscores:
<new>text1_text2_text3_text4_text5</new>

The text has different length, the number and the names of the tags inside the outer tags differ.
Example:
<aaa>text1<b>text2</b>text3<c>text4</c>text5</aaa>
or
<aaa>text1111<bbb>text2122</bbb>texttttt3<cc>text4</cc>text5</aaa>

Is it possible to do this using sed?

Unfortunately I am new to sed and this is too diffucult for me...

Thx in advance and greetings from Germany

Marc

Code:

echo '<aaa>text1<b>text2</b>text3<c>text4</c>text5</aaa>' | nawk -F'[<>]' -v OFS='' 'for(i=2; i<=NF; i+=2) $i=(i==2 || i==(NF-1))?"<new>":"_"; print}'

Code:

# echo '<aaa>text1<b>text2</b>text3<c>text4</c>text5</aaa>' | nawk -F'[<>]'  '{for(i=2; i<=NF; i+=2) $i=(i==2 || i==(NF-1))?"<"(i==(2)?"":"/")"new>":"_"}1' OFS=''
<new>text1_text2_text3_text4_text5</new>

good find, danmero - thanks for the fix.

Thx for your answers!
I think i did not express the problem clearly enough.
Now a second attempt:
My attention is to change the attached file content.xml as shown in the picture below:



The tag to be replaced (in the example of my first post "<aaa>") is not at the beginning of the structure. I did not mention it before because using sed this would not be a problem...

Regards

Marc