Hi VC
can you please execute SQLPLUS as ADM and ORA user ?
because the log above shows this
BR0278E Command output of 'sqlplus /nolog < /dev/null':
sh: sqlplus: not found
if you can't sqlplus as the ADM user please execute as a test from os
setenv PATH /oracle/SID/112_64/bin:$PATH (csh)
export PATH=/oracle/SID/112_64/bin:$PATH (ksh)
if sqlplus works after this then you need to make this permanent enviroment variable and restart the system to test
Best Regards
Marius