Getting substring of String

Hi all,

I am new to linux scripting, I want normal substring of a string that actually is a url as follows

SITEURL/main.php?page=122&type=download_file&fileID=9&user Id=user1&org=org1&mainmenu=main1&submenu=sub1

What I want is a substring like below

org1_user1_main1_sub1

Please help me solve the problem

Thanks in advance

Which programming language do you use? C/C++? Python? Bourne Shell? C Shell? Perl? PHP?

Thnx for you quick response.
I have to use linux shell script.

So I assume you use Bourne/Bash scripting language.
I suggest you to learn one thing or two about string manipulation in shell scripts. You may find good resources about this topic a lot, but here is one: Advanced Bash Shell Scripting Guide - Manipulating Strings
This tutorial uses expr for performing regexp operations but you can also use tools like grep or sed

Thnx for you help ..
but I am totally new to shell script programming ...
If you can mention some code.. it can help a lot

THanks again..

Code:

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s="SITEURL/main.php?page=122&type=download_file&fileID=9&user_Id=user1&org=org1&mainmenu=main1&submenu=sub1"
echo $s | awk -F "&" '{print $4}' | awk -F "=" '{print $2}'

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This outputs user1. You can loop through the second line to get the next fields, store in variables and concatenate at will.