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use strict;                  
my $db = 'C:\Inetpub\wwwroot\cgi-bin\test4.txt';
...

close(DATA);

34|4|45|56|45
45|34|45|00|23
...
34|4|456|56|03
36|4|456|56|03  #This line will be eliminated after the script is run 
+because last four fields are the same as the previous line.