Re^4: Writing to File based on condition

Thank you for the explanation, but in this example I learnt it is possible to print hash keys directly to an array without doing a for loop. I think the difference is in your example its an array you want to print to a filehandle

if( keys %old > $oldsize ) # only write if new ips added
  {
  open my $out, '>', $awsLists or die "$! opening $awsLists";
##print directly to the file the new keys difference
  print $out sort keys %old; # sort not needed, but nice touch :)
  close $out;
  }
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https://www.perlmonks.org/?node_id=1208878

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Re^5: Writing to File based on condition by shmem (Chancellor) on Feb 18, 2018 at 18:44 UTC
`print $out sort keys %old;` [download] Try that. As is, this would print all keys concatenated together as one string. That's fine if each key has a trailing record separator attached. perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'	[reply] [d/l]