#!/usr/bin/perl -w
use strict;
use warnings;

use constant BACKUP_PREFIX => 'backup_';
use constant COMMENT       => '\x2A'; 

use Getopt::Std;

my %options;
getopts( "f:" , \%options );

if( !exists $options{f} )
{
    &usage;
}
else
{
  my $m_file  = $options{f};
  &sort( $m_file );
}

sub sort
{
   my $m_file  = shift; 
   my $b_file  = BACKUP_PREFIX."$m_file";
   my $comment = COMMENT;

   my @save   = undef;
   my @backup = undef;

   open( my $file_m, "+<", $m_file ) || exit print "ERROR:Cant\'t open $m_file";
   open( my $file_b, ">", $b_file ) ;

   my $i = 0;
   my $b = 0;
   my $g = 0;

   while( <$file_m> )
   {
       if( substr($_, 0, 1) =~/$comment/  )
       {
          $b++;
       }
       else
       {
         $save[$g] = $_;
         $g++;
       }
       $backup[$i] = $_;
      $i++;
   }


   foreach ( @save )
   {
      print $file_m "$_";
   }
   close( $file_m );

   foreach ( @backup )
   {
       print $file_b "$_";
   }
   close( $file_b );

   &stats( $i,$b,$g,$m_file,$b_file );
}

sub stats
{
   my $comment = COMMENT ;
   my( $all,$good,$bed,$file_m,$b_file  ) = ( shift,shift,shift,shift,shift );
   printf "\t In all the lines               : %.3d \n".
          "\t Lines Containing     '%.4s'    : %.3d \n".
          "\t Lines not Containing '%.4s'    : %.3d \n\n".
          "\t Lines, Containing is stored in : %s   \n".
          "\t A back-up copy is stored in    : %s   \n",$all,$comment,$good,$comment,$bed,$file_m,$b_file  ;
}

sub usage
{
  print "\t  Usage   : $0 -f <file>   \n".
        "\t  Example : $0 -f file.txt \n";	
  exit 1;
}

*line1
line2

line3
*line4

 perl -f file.txt

In all the lines               : 005
Lines Containing     '\x2A'    : 002
Lines not Containing '\x2A'    : 003

Lines, Containing is stored in : file.txt
A back-up copy is stored in    : backup_file.txt

line2

line3