using sed in shell script

Shell Programming and Scripting
1

Hi,
i want to replace sub text which is in the middle of long text.

let me be more clear with an example.

Here is the actual text in the xml file

<module-option name="principalDNSuffix">,cn=Users,dc=X,dc=Y</module-option>

Now, in the above text, i want to replace all the content lying between <module-option name="principalDNSuffix">, and </module-option>
Please can some one help me to understand how to achive this using sed.

2

Try this,

 sed 's/\(<module-option name="principalDNSuffix">,\)\(.*\)\(<\/module-option>\)/\1replace\3/' inputfile
3

thanks.
I used the same but That din't work.

4

Here is a two step process. I am sure this can be done in single step also:

File

$cat 1.txt
<module-option name=principalDNSuffix>,cn=Users,dc=X,dc=Y</module-option>

Script

$sed -e 's:\(<module-option name=principalDNSuffix>\)::g' -e 's:\(<\/module-option>\)::g' < 1.txt > 2.txt

touch trim_log.txt

for i in `cat 2.txt`
do
sed s:$i::g < 1.txt >> trim_log.txt
done

Output

$cat trim_log.txt
<module-option name=principalDNSuffix></module-option>