#!/usr/bin/perl

use warnings;
use strict;

if (length ($ENV{'QUERY_STRING'}) > 0){
      my($buffer) = $ENV{'QUERY_STRING'};
      my(@pairs) = split(/&/, $buffer);
      foreach my($pair) (@pairs){
           ($name, $value) = split(/=/, $pair);
           my($value) =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1)
+)/eg;
           $in{$name} = $value; 
      }
 }

my($id) = param('id');

use LWP::Simple;
$id2 = get ("http://www.domain.info/stats.php?id=$id");

  $id2 =~ s*\[Yesterday\]  *Yesterday: *g;

while(<DATA>) {
   if(/([\w\s]+:)\s([a-z]+)(\d+)\2/) {
    print "$1 ", sprintf("%5.2f\n",$3*0.4/100); 
  }
}


spits out

Missing $ on loop variable at stats.cgi line 9.

on SSH.
[download]

I would assume that Perl is right when it points you to line 9.

...
foreach my($pair) (@pairs){
...
[download]

This is not valid Perl code. The valid Perl code would be (note the lack of parentheses)

foreach my $pair (@pairs){
[download]

But in all seriousness, why are you trying to do what is CGI.pm's job? Just use CGI; and then query $q->Vars to get a hash of parameters passed to your script. Don't parse query strings yourself.

#!/usr/bin/perl

use warnings;
use strict;

use LWP::Simple qw(!head);
use CGI qw(:standard);  # then only CGI.pm defines a head()

my($id) = param('id');

my($id2) = get ("http://www.domain.com/stats.php?id=$id");

$id2 =~ s*\[Yesterday\]  *Yesterday: *g;

**LOTS more search and replaces go right here**

while(<DATA>) {
   if(/([\w\s]+:)\s([a-z]+)(\d+)\2/) {
    print "$1 ", sprintf("%5.2f\n",$3*0.4/100); 
  }
}


Name "main::DATA" used only once: possible typo at stats.cgi line 15.
Use of uninitialized value in concatenation (.) or string at stats.cgi
+ line 11.  (Line geting the URL)
readline() on unopened filehandle DATA at stats.cgi line 15.
[download]

Its because you keep including that ENV{'QUERY_STRING'} garbage, get rid of it