Need help deleting trace files

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Hi,
I am new to Oracle RAC and I need to get rid of trace files since they are growing too big. I have one that is 22Gigs and I only have 60 Gigs available right now on that drive. I want to know if I can delete the file manually using the rm command.
My trace files are in: /u01/app/oracle/diag/rdbms/.../.../trace
The file I am concerned is called: "linux1_pz99_13299.trc" and "linux1_pz99_13299.trm"
I am using Oracle 11.1.0.6.0 on Oracle Unbreakable Linux.
Thanks for any help that can be provided.
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Is that really going to work?
It is my understanding (supported by some inconclusive observations and experiments) that once a trace file grows beyond about 8 kilobytes Oracle will hang onto it in a death grip. You may delete it but Oracle will still have the file handle open and be writing to it.
If the database is running on a Windows platform then an equivalent script will not even give the illusion of deleting the file.
It used to be the case that switching trace file output to a different directory would cause Oracle to release the active trace files but now the trace directory is part of the ADR heirarchy so switching is a more global and more intrusive operation and could interfere with other diagnostics.
You may have to rely on ADRCI's "purge" command unless there is a PL/SQL equivalent.
I shall be very interested to see what others have to say.