Hello emdub, and welcome to the Monastery!

Here is one way to do this (for a single pair of lines):

#! perl
use strict;
use warnings;

my $string1 = 'CHARLIE ROOT';
my $string2 = 'HARRY NODE';
my @list1   =  split //, $string1;
my @list2   =  split //, $string2;
my %hash1   =  map { $_ => undef } @list1;
my %hash2   =  map { $_ => undef } @list2;

delete $hash1{' '};
delete $hash2{' '};

for (@list1)
{
    print unless exists $hash2{$_};
}

for (@list2)
{
    print unless exists $hash1{$_};
}

[download]

Output:

16:26 >perl 815_SoPW.pl
CLI TY ND
16:26 >

[download]

There are no doubt more elegant/streamlined approaches, but this should give you an idea. (Extending the script to read and compare lines from the two files is left as an exercise!)

Hope that helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

In reply to Re: Mostly Harmless by Athanasius
in thread Mostly Harmless by emdub

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.