sub Subroutine_1_name{
  #Some code here
}
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. Input from STDIN can be read using the "<>" construct.

Choices between alternatives can be made using the "if" statement.

Loops can be made using the "while" statement.

Please research these components - they are sufficient to construct your program.

If you show us you tried something, and it did not work, we would be happy to help you.

I tried something but the problem is it won't go back to the main menu when I picked 1 or 2.

Here's my test code for checking ping and DNS of a host (just a part of it for the menu testing).

use Net::Ping;
require LWP::UserAgent;
use HTTP::Headers;
use NET::DNS;
use Socket;
use NET::IP;
use Time::HiRes qw( gettimeofday );

my @url = ('www.google.com', 'www.yahoo.com');

sub exit_st();
sub check_ping();
sub check_dns();
open(OUTFILE, ">", "check_result3.txt") ? print "\n\nProcessing the re
+sult...\n\n" : die "Can't process the result, unable to write output:
+ $!";
%action = (
    '1' => \&check_ping,
    '2' => \&check_dns,
    '3' => \&exit_st,);

print <<"EOT";

Select one of:

1. Ping Check
2. DNS Check
3. Exit

EOT

print "Enter your choice here: ";
my $menu_item = <>;
chomp($menu_item);
(defined $action{$menu_item}) ? $action{$menu_item}->() : print "Wrong
+ input. \n";

exit 0;

#Check Ping
sub check_ping()
{
print OUTFILE "*Ping Result*\n";
my $p = Net::Ping->new("icmp");

($p->ping($url[0])) ? print "$url[0] is alive.\n" : print "$url[0] is 
+not alive\n";
($p->ping($url[1])) ? print "$url[1] is alive.\n\n" : print "$url[1] i
+s not alive.\n\n";
return 0;
}

#Check DNS
sub check_dns()
{
print OUTFILE "*DNS Result*\n";

$ip1 = gethostbyname($url[0]) || die "error - gethostbyname: $!\n\n";
$hostip1 = inet_ntoa($ip1) || die "error - inet_ntoa: $!\n\n";
print $url[0], " = ", $hostip1;
return;
}
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I don't know where the looping should take place, so confused hehe.. thanks

You want something like:

my $menu_item;
while (lc $menu_item ne 'q') { # allow 'q' to quit
  print "Enter your choice here: ";
  $menu_item = <>;
  chomp($menu_item);
  (defined $action{$menu_item}) ? $action{$menu_item}->() : print "Wro
+ng input. \n";
}
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perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'