city_code3         state_code3      zip_code3
5879654              5679834              987656575
r658735               6578789               657656315
z0r3454               6456884               554865434

</c
<p>
out put file will have new_id from file1, old_id from file2, and 
zip_code3 from file3 only if state_code2 from file2 not equal to state_code3 from file3 and city_code3 from file 3 not equal to city_code1 form file1
</p><p>

after running the script I do not get the value of  "Old_id" and  "city_code3"
</p>
<c>

new_id    Old_id  zip_code3

new_id    Old_id  987656575

new_id    Old_id  657656315

new_id    Old_id  554865434

new_id    Old_id  987656575

new_id    Old_id  657656315

new_id    Old_id  554865434