SQL & PL/SQL :: Writing Turkey Characters To Text File?

Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE 11.2.0.3.0 Production
TNS for Linux: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production

I am trying to write the Turkey character stored in the table in VARCHAR2 to Unix file. But when the text is written to the unix, the characters are coming as junk.

The output of the file it is writing is as below after the execution

Fis Içe Aktarma Olusturuldu Header
Fis Içe Aktarma Olusturuldu
Fiş İçe Aktarma Oluşturuldu

Instead I expect the chararecter to be as "Fiş İçe Aktarma Oluşturuldu Header" which when converted to English will show as "Created Import Plug Header".

DROP TABLE TEST_JUNK_CHAR
/
CREATE TABLE TEST_JUNK_CHAR (primary_description VARCHAR2(400))
/
INSERT INTO TEST_JUNK_CHAR VALUES('Fiş İçe Aktarma Oluşturuldu Header')

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