in reply to Remove whitespace between lines

Change your while loop:
while (my $line = <$fh_in>) { my $text = $line; chomp ($text); #Strip/remove whitespace between lines of text file; while (<STDIN>) { print if (!/^\s*$/); } print $fh_out "$text\n"; #Save stripped results; }
as follows:
while (my $line = <$fh_in>) { print $fh_out $line if (!/^\s*$/); }
Update: Sorry, I wrote that above message on my mobile device in the train commuting back to home, the train was arriving near my town, so I copied and pasted the code a bit to hastily. The above code should be:
while (my $line = <$fh_in>) { print $fh_out $line if $line !~ /^\s*$/; }
Update 2: I had not noticed when I wrote the first update above, but poj sent me a CB message proposing a very similar correction. Thanks to poj. Further update: I had also not seen that poj also posted the correction as an answer to your question, so that these updates end up not to be very useful...

Je suis Charlie.

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Re^2: Remove whitespace between lines
by wrkrbeee (Scribe) on Feb 03, 2015 at 13:41 UTC
    Thank you for the simple solution. It gives me the error of "use of uninitialized value $_ in pattern match." Over my head for sure.
      Try
      while (my $line = <$fh_in>) { print $fh_out $line if ($line !~ /^\s*$/); }
      poj
        That's it, works great! Appreciate your interest and patience! :-)
Re^2: Remove whitespace between lines
by Anonymous Monk on Feb 03, 2015 at 13:58 UTC

    Here the pattern can be further simplified: print if /\S/;