It seems it compares only the first line of FH with all lines from F2. You must either re-wind F2 each time the while(@a2 = <F2>){} exits using: seek F2, 0, SEEK_SET; . Or, read @a2 = <F2> outside both loops, just like @a1=<FH>.

In reply to Re^2: partial matching of lines in perl by bliako
in thread partial matching of lines in perl by Sidd@786

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