Shell Programming and Scripting

I have seen the old forums before posting this thread...I did not find the designated answer for my shell script... I am novice in shell programming:

Can some one help on how i can loop with in the loop when comparing two files...

I need to compare ID in File1 with IDs in File2...If the ID match output to File3. If the ID in FILE1 do not find in FILE2 then check to see what id is that (compare should be wild card) like if file1 id = 'un*' then output all the "un*" ids into file4 otherwise rest of the ids to go into file5.

File1 looks like:

Code:

UN1234
UNRC01
UNKEYU
A1NM8
A7IOK9

File2 looks like :

Code:

A1NM8
A7IOK9
A4IOP4
K2IOU9

Please help me...
Thanks

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