yes the installation went well.
the libsqlplus.so is located in /oracle/DE7/11203/lib.I have chaked and found--
for orade7
LD_LIBRARY_PATH=/oracle/DE7/11203/lib:/usr/sap/DE7/SYS/exe/uc/linuxx86_64:/usr/sap/DE7/SYS/exe/run:/oracle/DE7/112_64/lib
for root
LD_LIBRARY_PATH=/oracle/DE7/11203/lib
is the path set correctly?
Best Regards,
Debaditya