oradebug CLOSE_TRACE

I read oracle-l - How to free inodes in Linux without killing processes From: Tanel Poder
I learned with oradebug ...
Example:

$ mv orcl_lgwr_14604.trc orcl_lgwr_14604.trc.old
$ ls -la *14604*
-rw-r----- 1 oracle oinstall 18764 Jul 13 22:38 orcl_lgwr_14604.trc.old

SQL> oradebug help
CLOSE_TRACE Close trace file

SQL> oradebug setospid 14604
Oracle pid: 6, Unix process pid: 14604, image: oracle@oratest (LGWR)

SQL> oradebug close_trace
Statement processed.

SQL> oradebug TRACEFILE_NAME
/u01/app/oracle/admin/orcl/bdump/orcl_lgwr_14604.trc

SQL> !ls -la *14604*
-rw-r----- 1 oracle oinstall 679 Jul 14 18:02 orcl_lgwr_14604.trc
-rw-r----- 1 oracle oinstall 18948 Jul 14 18:01 orcl_lgwr_14604.trc.old