Hii thanks again for answer. But still u are not able to understand my problem. The output of your code will be done in another file. But i want to do it in same. I tried something like this : 
   open my $fhi, '<', 'C:\shekhar_Axestrack_Intern\WindowCreation\List
+OfIpAdress.txt', or die "Could not open file $!";
    open my $fho, '>', 'C:\shekhar_Axestrack_Intern\WindowCreation\Lis
+tOfIpAdress2.txt', or die "Could not open file $!";
    while (my $line = <$fhi>) 
    {   
     
        print "Total Difference in Hour is : $div \n\n";
         print $fho $line unless $div > 36;
    }
    close $fhi;
    close $fho;
    rename 'C:\shekhar_Axestrack_Intern\WindowCreation\ListOfIpAdress2
+.txt', 'C:\shekhar_Axestrack_Intern\WindowCreation\ListOfIpAdress.txt
+';

[download]

But as a result file ListOfIpAdress.txt is blank which was supposed to be replaced by ListOfIpAdress2.txt which we obtained from print $fho $line unless $time > 36; The problem is i want to have the output in the same file not in 2 different files.

In reply to Re^4: How to delete a particular line in a text file after some operation on that text file at the same time by ppp
in thread How to delete a particular line in a text file after some operation on that text file at the same time by ppp

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