http://www.perlmonks.org?node_id=988633


in reply to Re^4: How to convert an @ARGV to form based input?
in thread How to convert an @ARGV to form based input?

Ok, now the error message looks differently, don't you agree? :)

$domain is already defined, but uninitialized. Please replace my $domain; with my $domain = 'google.com'; and check the result.

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Re^6: How to convert an @ARGV to form based input?
by taint (Chaplain) on Aug 21, 2012 at 08:18 UTC
    Yes, I agree. :)
    Just tried this:
    #!/usr/bin/perl -w

use strict;
use Net::DNS;
my $dns = new Net::DNS::Resolver;

my $domain;

if($domain ne "") {
    my $mx = $dns->query( $domain, 'MX' );

print "content-type:text/html; charset=utf-8\n\n";
    print "$domain:\n\n";
    foreach my $rr ($mx->answer) {
        print "<br />", $rr->exchange, ' [<b>', $rr->preference, "</b>
+]\n";
    }
} else {
print "content-type:text/html; charset=utf-8\n\n";
print "<form action=\"dnsdig.cgi\" method=\"post\">
<input name=\"domain\" type=\"text\" value=\"\" />
<input type=\"submit\" value=\"Get MX\" />
</form>";
}

    [download]
    But again, fail:
    Use of uninitialized value $domain in string ne at dnsdig.cgi line 9.
Use of uninitialized value $domain in string ne at dnsdig.cgi line 9.,
+ referer: ...

    [download]
    Now I'll use your newest recommendation (which I know will work), but doesn't provide the empty form field I'm looking for -- but I'll do it anyway. :)
    --Chris 
    #!/usr/bin/perl -Tw
use perl::always;
my $perl_version = "5.12.4";
print $perl_version;
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      Well, as you might expect, the output returned:
      google.com:
alt3.aspmx.l.google.com [40 +]
alt4.aspmx.l.google.com [50 +]
aspmx.l.google.com [10 +]
alt2.aspmx.l.google.com [30 +]
alt1.aspmx.l.google.com [20 +]

      [download]
      Now, if I could only figure out how to return the form field...
      changing eq "" to ne "" didn't return form fields either. :(
      Thanks again for taking the time to respond.
      --Chris 
      #!/usr/bin/perl -Tw
use perl::always;
my $perl_version = "5.12.4";
print $perl_version;
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