Find the Tablespace size in putty

select nvl(b.tablespace_name,nvl(a.tablespace_name,'NA')) " Tablespace" 
         , kbytes_alloc/1024 "Allocated" 
         , (kbytes_alloc-nvl(kbytes_free,0))/1024 "used" 
         , nvl(kbytes_free,0) /1024 "free" 
from (select sum(bytes)/1024 Kbytes_free 
                  , max(bytes)/1024 largest 
                  , tablespace_name 
         from  dba_free_space 
         group by tablespace_name) a ,
       (select sum(bytes)/1024 Kbytes_alloc 
                 ,tablespace_name 
        from  dba_data_files 
        group by tablespace_name) b 
where a.tablespace_name (+) = b.tablespace_name 
and b.tablespace_name like '%' 
order by 4 ;