Need a script to tar all file systems on the machine into one filesystem.

Shell Programming and Scripting
1

Hi
I am very poor at scripting.:o

I need to develop a script that should tar up all the filesystems on the machine on to a single filesystem called /tarfilesystem.

Any suggestions ...
Thank You very much

2 
tar cf /tarfilesystem/all.tar $( echo /* | grep -v tarfilesystem)

(This assumes that there are no spaces in the directory names in the root directory.)