I added the same lines but I am getting the below error
  
   "env:this is not a file or a directory"


BEGIN {
  unless ($ENV{BEGIN_BLOCK}) {
    $ENV{ORACLE_HOME}     = '/opt/instantclient_10_2/';
    $ENV{LD_LIBRARY_PATH} = '/opt/instantclient_10_2/';
    #$ENV{TNS_ADMIN}       = '/common/oracle/env';
    $ENV{BEGIN_BLOCK} = 1;
    exec 'env',$0,@ARGV;
  }
}