# open the input and output files

open( my $in_fh, '<' ...
open( my $out_fh, '>' ...

# operate on a single line at a time rather than reading the
# input file in all at once (more memory-efficient if the
# input file is very large)

while( my $line = <$in_fh> )
{
    # skip the line if it contains only white space,
    # otherwise print it to the output file

    next if $line =~ m/^\s*$/;
    print $out_fh $line;
}

close $in_fh;
close $out_fh;

[download]

In reply to Re: Removing white-lines... by bobf
in thread Removing white-lines... by pyro.699

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.