How to drop datafile from tablespace in Oracle 8i

Oracle 8i
There is no direct sql command to drop datafile from tablespace.
In that case we need to drop tablespace after move all data to new tablespace.
1. create new tablespace
2. move all table to new tablespace
3. move all index to new tablespace
4. move all other objects to new tablespace
5. drop old tablespace with including contents;
6. through OS command remove all datafiles belongs to droped tablespace.

Well, one way may be :
1. create a new tablespace
2. move all objects from your old tbs to the new
3. drop your old tablespace
4. recreate your tablespace with the size as well
5. moveback objects to this last tbs
6. drop your tbs created on step 1
7. rebuild index.