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    my $in_file = 'b2bclient-gateway-heartbeat.log';
    open my $in_fh, '<', $in_file or die "Could not open file $in_file: $!
    +";
    ...
    
    close $in_fh  or die "Could not close file $in_file: $!";
    close $out_fh or die "Could not close file $out_file: $!";