A somewhat generalized solution to the problem allows a arbitrary number of files to be handled:
use strict;
use warnings;
my $file1 = <<'END_FILE';
1 G
2 F
4 H
8 T
END_FILE
my $file2 = <<'END_FILE';
5 Y
6 R
7 E
8 I
END_FILE
my $file3 = <<'END_FILE';
2 H
4 T
3 G
8 R
END_FILE
my @fileHandles;
open $fileHandles[@fileHandles], '<', $_ for \$file1, \$file2, \$file3
+;
printLines (@fileHandles);
close $_ for @fileHandles;
sub printLines {
my @fileHandles = @_;
my $moreLines = 1;
while ($moreLines) {
my $line = '';
for my $fh (@fileHandles) {
$line .= ' ' if length $line;
$line .= <$fh> or return;
chomp $line;
}
print "$line\n";
$line = '';
}
}
Prints:
1 G 5 Y 2 H
2 F 6 R 4 T
4 H 7 E 3 G
8 T 8 I 8 R
True laziness is hard work
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