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#! /bin/bash
while read ip
do
ping $i
done < serverlist > output.txt_$$

$ cat a.txt
ABC_DATA_CUSTIOMERS_20120617.dat
ABC_DATA_PRODUCTS_20120617.dat

$ cat a.txt | awk -F"[_.]" '{print $3"."$NF}' a.txt
CUSTIOMERS.dat
PRODUCTS.dat

If your file name happens to change frequently then you have re-write the code to take the argument from a seperate static file.


#!/bin/ksh

today=`date +"%d_%m_%y"`

while read FILE
do...

Please be specific with your question. How do you want to find the line in first file, is it by pattern or line number and which line should get replaced in 2nd file???