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compare two variables and get common values

Hi
I have a comma separated values in two variables, would like to compare both variables and get values which are available in both variables.

leftString="ami-06bc7b1fd6d88be49,ami-04db3b64b5f3990dd,ami-0063dd4d697377715,ami-01f8ea3141121cda4,ami-083a15980f7fcf2ad,ami-0b22b5f710211"
rightstring="ami-023d322923f1bb271,ami-0390dfc7d966ce65d,ami-04db3b64b5f3990dd,ami-05f492333c31e3971,ami-066e692403bb98cd3,ami-06bc7b1fd6d88be49,ami-07ebe2d3da06f1831,ami-0a621c6a67fc67a3f,ami-0afa5ade0d61726ef,ami-0b41712d2aef56be1,ami-0f0b1e112bdf5034f"

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what we are expecting in the final variable as below..since they are in both.

compareString="ami-06bc7b1fd6d88be49,ami-04db3b64b5f3990dd"

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thanks in advance

enthuguy

ASKER

I was playing around using comm but no luck yet

NAME
       comm - compare two sorted files line by line

SYNOPSIS
       comm [OPTION]... FILE1 FILE2

DESCRIPTION
       Compare sorted files FILE1 and FILE2 line by line.
       With no options, produce three-column output.  Column one contains lines unique to FILE1, column two contains lines unique to FILE2, and column three contains lines common to both files.

       -1     suppress column 1 (lines unique to FILE1)
       -2     suppress column 2 (lines unique to FILE2)
       -3     suppress column 3 (lines that appear in both files)

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ASKER CERTIFIED SOLUTION

skullnobrains

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enthuguy

ASKER

Thanks very much, that was very helpful