You can try the format method. See perldoc format. 
#!/usr/bin/perl

my $foo = '';
open FH, '+>', \$foo or die $!;


format FH_TOP =
                   WHO COMMAND OUTPUT
USER        TERMINAL     DATE & TIME              LOCATION
-----------------------------------------------------------
.

my @who_output= `who`;

foreach my $line (@who_output) {
my ($userid,$terminal,$month,$day,$time,$location) = split(/\s+/,$line
+);
chomp $location;

format FH =
@<<<<<<<    @<<<<<<<<<  @<<< @<<  @<<<<<        @<<<<<<<<<<<<
$userid  $terminal  $month  $day   $time  $location
.
write FH;
}

#print "$foo\n";

use Tk;
my $top = new MainWindow;
my $txt = $top->Scrolled("Text")->pack;

 $txt->insert('end', "$foo\n") ;

MainLoop;

[download]
I'm not really a human, but I play one on earth.
Old Perl Programmer Haiku ................... flash japh

In reply to Re: Formatting text-Create table -perl Tk by zentara
in thread Formatting text-Create table -perl Tk by reaper9187

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.