ls -la $ORACLE_HOME/sqlplus/mesg/ ls -la $ORACLE_HOME/sqlplus/mesg/*.msb
or
ls -l $ORACLE_HOME/lib/libsqlplus.so
The error message is a common frustration for Database Administrators and developers working with Oracle databases. This error typically occurs immediately upon launching the sqlplus executable from the command line.
The user attempting to run SQL*Plus must have read access to the libraries and execute access to the binaries. If you installed Oracle as the oracle user, but are running it as johndoe , verify permissions: If you installed Oracle as the oracle user,
ORACLE_HOME must point directly to the root folder of your Oracle Database or Oracle Instant Client installation. Do not include a trailing slash.
Check that LD_LIBRARY_PATH includes $ORACLE_HOME/lib . You can set this by running export LD_LIBRARY_PATH=$ORACLE_HOME/lib in your terminal. but are running it as johndoe
Before applying a fix, it helps to understand why this initialization roadblock happens: Root Cause Technical Description Affected Platforms