Adapting my reply to Reading files n lines a time illustrates another approach:
use strict;
use warnings;
my $fname = shift or die "usage: $0 fname\n";
open(my $fh, '<', $fname) or die "error: open '$fname': $!";
my $chunksize = 2;
my $chunk = "";
while ( my $line = <$fh> ) {
$chunk .= $line;
next if $. % $chunksize;
print "---chunk---\n$chunk";
$chunk = "";
}
close $fh;
if (length $chunk) {
print "---chunk (leftover)---\n$chunk";
}
Sample output with two simple test files, one with four lines:
---chunk---
one
two
---chunk---
three
four
and one with five lines:
---chunk---
one
two
---chunk---
three
four
---chunk (leftover)---
five
For your use-case you would obviously do something different to my crude printing of chunks above.
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