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This is "comma operator". The "true" or "false" of the "while" only depends upon the state of $test2.

Oh, completely missed that.. All my tests had the second file longer than the first. ++ for the explanation! If I may take another moment of your time, I tried fixing that code from before, although now I think that I'm using one of those endless loops you adviced against:

while (my ($test1, $test2) = (scalar <$fh1>, scalar <$fh2>)) { last unless defined $test1 or defined $test2; ... }
I figure that the simplest fixes (for me, that is: Feel free to kick me on the right path) would be to either use the defined-or on the results of the readlines, replacing the undefs with the empty list, or move everything into a sub.

..actually, rather than talk about it:

defined-or'ing

while ( my $test1, $test2 ) = (scalar <$fh1> // (), scalar <$fh2> // ( +) ) { ... }
sub'd
sub read_double_file { my ($fh1, $fh2) = @_; my ($line_file_1, $line_file_2) = (scalar <$fh1>, scalar <$fh2>); (defined $line_file_1 or defined $line_file_2) ? ($line_file_1 //= +'', $line_file_2 //= '') : (); } while ( my ($line_from_1, $line_from_2) = read_double_file($fh1, $fh2) + ) { ... }
Is there a better approach? (For whatever reason, trying to solve this has been quite fun -- I'm even thinking about meddling with objects, just so I don't have to pass the filehandles over and over to the subs) Are the attempts so far horribly, terribly wrong?

In reply to Re^3: Reading two text files parallelly... by Hugmeir
in thread Reading two text files parallelly... by biswanath_c

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