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comparing files in shell script

Asked by prasen in Unix Operating Systems, HP-UX Unix, IBM AIX Unix

Im trying to compare the contents of a file with another file file, and then if it exists, will replace the string with a text, like this --
1:
2:
3:
4:
5:
6:
7:
for i in `cat fileA.txt`
do
    grep $i $1 | sed 's/$i/\/\/REVIEW: $i does not exit/g'  >> log_$1
done 
 
here I will pass filename, say fileB.txt as parameter
I'm trying to grep list from fileA, check if it exist in fileB, then replace the list with a string
[+][-]09/05/09 09:14 PM, ID: 25268720Expert Comment

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