#!/usr/perl/bin
#=============================================================#
#
#
#
#==============================================================#
use strict;
use File::Find;
use Sys::Hostname;

my $fileupdate; 
my $old_hostname = hostname(); #current hostname
my ($orig,$concat,$new_hostname,$answer);
my @lines = " ";
my $new_hostname = "";
## Create new hostname based on physical address ###
$new_hostname = shift;
if ($new_hostname eq "" )
{
   open(I,'ipconfig /all |');
   while(<I>) 
   {
       next unless /Physical Address/;
       /:/;  
       chomp;
       tr/-//d;
       $new_hostname = "css" .(lc substr($_, -6,5)) ;
       last;
   }
    print "Current host name of machine is :$old_hostname \n";
    print "The new host name is going to be: $new_hostname\n"; 
}

  if ( $old_hostname ne $new_hostname )
    {
      &personalization;
    }
  else
   {
     print "System already personlized\n"; 
   } 
  
 
#---------------------------------------------------------------------
+------------------------
sub personalization
{    
     
   open(FH,"<c:\\person.txt") || die "Can't open arp.txt: $!\n";
     while(my $line = <FH>) 
     {   
        print "line $line\n";
         if( $line =~ /(.*)$old_hostname(.*)/i ) # any files that cont
+ain the substring of the old hostname
         {    
              print "file that match $line\n";
              $orig = $line;
              $concat = $line;
              $concat =~ s/(.*)$old_hostname(.*)/$1$new_hostname$2/gi;
 
             #CALL UPDATE SUBROUTINE
              &modified_file($concat);
              rename($orig, $concat) || print "error can't rename $ori
+g to $concat: $!";
          }
         else
            {
              &modified_file($orig );
            }
     }
}
#---------------------------------------------------------------------
+------------------------
sub modified_file
{   
          $fileupdate = shift;
          
     
          open (IN,"<$fileupdate");
          @lines = <IN>;
          close IN;
         
          my $change_count = 0;
          @lines = map { $change_count++ if s/$old_hostname/$new_hostn
+ame/sgi; $_ } @lines;
          next unless $change_count;
          open (OUT,">$fileupdate") || "can't open $fileupdate for wri
+ting :$! ";
          print OUT @lines; 
          close OUT;
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update (broquaint): added formatting + <readmore> tag