Problems with sqlplus (Oracle)

[magic_rooter]

Hello. I have just installed sqlplus in order to write my own perl
plugin to check oracle db.
But I have the following errorw while connecting and I don't know what to do:(

[root at nagios libexec]# sqlplus user/pass@//server/test_db
SQL*Plus: Release 10.1.0.5.0 - Production on Tue Feb 13 11:21:58 2007

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified


Enter user-name:
ERROR:
ORA-12162: TNS:net service name is incorrectly specified
______________________
I made strace of sqlplus and saw that I have no tnsnames.ora and
sqlplus.ora files. I have made it and put to /root/.sqlplus.ora and
/etc/tnsnames.ora
Here are these files:
tnsnames.ora
TEST =
  (DESCRIPTION = (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = server)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SID=TEST)
    )
  )

sqlnet.ora
names.directory_path= (tnsnames)
sqlnet.expire_time = 30

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