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  1. or download this
    #!/usr/bin/perl

...

close( $input );
close( $output );
  2. or download this
    syntax error at test.pl line 12, near "} while"
Execution of test.pl aborted due to compilation errors.
  3. or download this
    print $output while (<$input>);
  4. or download this
    GLOB(0x84f3bdc)GLOB(0x84f3bdc)....
  5. or download this
    print {$output} $_ while (<$input>);
or
print $output $_ while (<$input>);
  6. or download this
    #!/usr/bin/perl

...

close( $input );
close( OUTPUT );