So, basically I want to insert a sub-log to a main log that is currently open. I was thinking of what people mentioned here and realized that I should not even be attempting to 'open' the main log file that is currently open. Instead I should just open the sub-log and print it on the standard output which will then be placed in the main log.

Anyway, to people who might encounter this twisted logic. Here's the code that would do this.

#!/usr/bin/perl

use warnings;
use strict;

my $main_log = '/tmp/main_log.txt';
my $sub_log  = '/tmp/sub_log.txt';

print "Start: Coming from the script.\n";

print "Coming from re-opening the opened log file.\n\n";
open( my $sub_log_file, '<', $sub_log )
  or die( "Error: Cannot open $sub_log" );
print $_ while( <$sub_log_file> );
close( $sub_log_file );

print "End: Coming from the script.\n";
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To run, simply do this.

#$ perl test.pl > /tmp/main_log.txt
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And I think this would be a good example of I know what I mean. Why don't you?