You should definitely use code tags

I'm not sure what you mean with "other file" but it looks like your problem might be that the contents of your file gets overwritten. That's because you open the same file with ">" (overwrite) throughout the while loop, or at least you were before commenting out those lines. Do it like this instead:

my $a="/var/lib/processed/parkings-stats2/dailystat_$curtime"; 
print $a;
open (FH, '>', $a) or die "could not open"; 
while(my $row=$sth->fetchrow_hashref) { 
  my $eunq= $row->{eunq};
  my $eclk=$row->{eclk}; 
  my $domain_id=$row->{domain_id}; 
  my $ts = $row->{ts}; 
  my $id = $row->{id}; 
  my $ervn = $row->{ervn}; 
  my $account_id=$row->{account_id}; 
  print "$eunq==$domain_id\n"; 
  print FH "$account_id"; 
  print "$eunq\t$eclk\t$domain_id\t$ts\t$id\t$ervn\t$account_id\n";
}
close FH;
[download]

Does that solve your problem?

i want above output in other file without using file handler ..i think it is system command or anythink else help appreciated.

Usually, it is a bad idea to involve the shell. You have to fork the shell and execute the command which will open, write, and close the file. As a bonus, the shell will interpret your data on the way to the file so you will need to escape the data properly or open a big can of worms that includes a gaping security hole.

It is much faster and less error prone to open, write, and close a file handle yourself (as tospo has demonstrated). If you really want the shell to process your output, you'll want to use backticks, system or open a pipe to execute a shell command like echo.