LinuxQuestions.org - Unwanted folder structure created while UNTAR

Problem :

I have 20 files(txt files) under the folder:

/a1/a2/a3/

e.g /a1/a2/a3/abc.txt , /a1/a2/a3/abcd.txt , etc

I want them to tar+gzip them individually to folder

/a1/b1/b2/b3

Also I want to create a final tar of all those files in the folder (/a1/b2/b2/) and name it as "final.tar"

My Attempt :

Code:

for file in /a1/a2/a3/*

do

    file1='echo $file | awk -F'/' '{print $5}'  # get filename

    tar -cvzf /a1/b1/b2/b3/$file1".tar.gz" /a1/a2/a3/$file1

done



tar -cvf /a1/b1/b2/"final.tar" /a1/b1/b2/b3

final.tar is succesfully created.

Problem :
When I untar the final.tar file to get the individual tar+gzip files using :

Code:

tar -xvf final.tar

a folder is created inside the target foilder and all the 20 files(tar+gzipped) are found in the directory
/a1/b1/b2/a1/a2/a3/

So new directory structure is created inside the target folder. Which I dont want.
Help Needed.