Query related to sysctl.conf, limits.conf file

Hi All gurus,
Can you please guide me i watch one server running on Unix with Oracle DB when i try to check sysconf file with root user i didn't find file and same for limit.conf file
Can anyone please guide me in the absence of these files how db is running

But when i try to connect using RMAN i am getting below error:
-bash-3.00$ rman target sys/vikas@bscs
Recovery Manager: Release 10.2.0.1.0 - Production on Wed Apr 4 13:09:56 2012
Copyright (c) 1982, 2005, Oracle. All rights reserved.
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00554: initialization of internal recovery manager package failed
RMAN-04005: error from target database:
Error while trying to retrieve text for error ORA-12541
Please help me out anyone

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