Another (and less efficient) way, using Tie::File:
use strict;
use warnings;
use Tie::File;
my @fnames = @ARGV;
my @fhandlers;
for my $fname (@fnames) {
tie my @farr, 'Tie::File', $fname or die $!;
push @fhandlers, \@farr;
}
# Traverse the files:
for my $i (0..$#{$fhandlers[0]}){
my @nextvals = map {$_->[$i]} @fhandlers[0..$#fhandlers];
# @nextvals has the next line of each file
}
untie $_ for (@fhandlers);
Beware of possible overheads if the files are very big. (0..$#{$fhandlers[0]}) traverses the whole first file just for know how many lines it has.
Update: Added note about efficiency
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