Just about everything you need is in the data dictionary, all you need is to run a query against the DB to create the script. This will take care  of the bulk of the script generation but you should be careful when running this script and be sure to do your due diligence regarding ensuring everything is taken care of. You will need to backup the control, have a list of the files and locations, ensure there are no datafiles with the same name in different filesystems, ensure there are no files with spaces or confusing/erroneous errors, etc.

 
A quick hot backup script to place each tablespace in backup mode, copy the files, take the tablespace out of backup mode....

select distinct a.dbcmd,''||chr(13)||oscmd,''||chr(13)||c.dbcmd from

(select 'alter tablespace '||tablespace_name||' begin backup;'dbcmd,tablespace_name from dba_tablespaces group by tablespace_name)a,

(select '! cp '||file_name||' /backup_dir'oscmd,tablespace_name from dba_data_files)b,

(select 'alter tablespace '||tablespace_name||' end backup;'dbcmd,tablespace_name from dba_tablespaces group by tablespace_name)c

where a.tablespace_name = b.tablespace_name

  and c.tablespace_name = b.tablespace_name;