The binary operator dot takes two arguments and concatenates the data from the right operand to the left operand. Combine with an equal sign to concatenate and assign with one operator. 

my $data = $self->cmd('show run', undef, $output_ref, qr/^(?![:!])/);
$data .= 'appended data';
# Equivalent to
$data = $data . 'appended data';

[download]

Additive Operators

my $data = $self->cmd('show run', undef, $output_ref, qr/^(?![:!])/);
$data .= $self->cmd('some other command', undef, $output_ref, qr/^(?![
+:!])/);

[download]

You also have to think about context. You probably don't want to append a list to a scalar. If $self->cmd returns a list, that's what you would be doing. 

use strict;
use warnings;

sub something { return (3,4,5) };

my $x = 'some data'; #scalar
$x .= something; #list

print $x;
# some data5

print "\n";
print something;
# 345

[download]

In reply to Re: Get outputs from 2 commands and add to var by trippledubs
in thread Get outputs from 2 commands and add to var by Cisco_Dave

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.