[oracle@www bin]$ export ORACLE_HOME=/home/oracle/oracle/product/10.2.0/db_1/bin
[oracle@www bin]$ echo $ORACLE_HOME
/home/oracle/oracle/product/10.2.0/db_1/bin
[oracle@www bin]$ ./sqlplus system@iamtrying
Error 6 initializing SQL*Plus
Message file sp1<lang>.msb not found
SP2-0750: You may need to set ORACLE_HOME to your Oracle software directory
[oracle@www bin]$ ./sqlplus / as sysdba
Error 6 initializing SQL*Plus
Message file sp1<lang>.msb not found
SP2-0750: You may need to set ORACLE_HOME to your Oracle software directory
[oracle@www bin]$