#!/usr/bin/perl

  # $Id: hpsetdisp.pl 2 2008-07-10 00:05:58Z yaakov $

  # hpsetdisp.pl  
  # Connects to a JetDirect equipped HP printer and uses 
  # HP's control language to set the ready message on the
  # LCD display.  Takes an IP address and message on the
  # command line. My favorite message is "INSERT COIN".
  # Keep in mind the limitations of the display when composing 
  # your clever verbiage.
  # 
  # THIS PROGRAM IS PROVIDED WITH NO WARRANTY OF ANY KIND EXPRESSED OR IMPLIED
  # THE AUTHOR CANNOT BE RESPONSIBLE FOR THE EFFECTS OF THIS PROGRAM
  # IF YOU ARE UNCERTAIN ABOUT THE ADVISABILITY OF USING IT, DO NOT!
  #
  # Yaakov (http://kovaya.com/)

use strict;
use warnings;

unless (@ARGV) { print "usage: $0 <ip address> \"<RDYMSG>\"\n" ; exit }
if ($ARGV[3]) { print "Your New Message\n" ; exit }

my $peeraddr = $ARGV[0];
my $rdymsg = $ARGV[1];
chomp $peeraddr;

use IO::Socket;
my $socket = IO::Socket::INET->new(
    PeerAddr  => $peeraddr,
    PeerPort  => "9100",
    Proto     => "tcp",
    Type      => SOCK_STREAM
    ) or die "Could not create socket: $!";

my $data = <<EOJ
\e%-12345X\@PJL JOB
\@PJL RDYMSG DISPLAY="$rdymsg"
\@PJL EOJ
\e%-12345X
EOJ
;

print $socket $data;

I found this script online and thought to myself, "I must use this in the office!" All you need to do is create a name_of_file.pl file, and execute this command in your terminal. $ name_of_file.pl <insert> "Insert message"

Pearl: Modify text screen on HP 4100-4200 Laserjet Printers

Perl