Code:
SSESMADT001:oracleuser:e73gc04:/home/tdata/oracleuser> echo $NLS_LANG
SPANISH_SPAIN.WE8ISO8859P1
SSESMADT001:oracleuser:e73gc04:/home/tdata/oracleuser> sqlplus /

SQL*Plus: Release 3.3.4.0.1 - Production on Wed Jul 16 12:46:06 2003

Copyright (c) Oracle Corporation 1979, 1996.  All rights reserved.


Conectado a:
Oracle7 Server Release 7.3.4.5.0 - Production
With the distributed, replication and parallel query options
PL/SQL Release 2.3.4.5.0 - Production

SQL-SSESMADT001-E73GC04>select * from x;
select * from x
              *
ERROR en l*nea 1:
ORA-00942: la tabla o vista no existe


SQL-SSESMADT001-E73GC04>quit
Desconectado de Oracle7 Server Release 7.3.4.5.0 - Production
With the distributed, replication and parallel query options
PL/SQL Release 2.3.4.5.0 - Production
SSESMADT001:oracleuser:e73gc04:/home/tdata/oracleuser> export NLS_LANG=AMERICAN_AMERICA.WE8ISO8859P1
SSESMADT001:oracleuser:e73gc04:/home/tdata/oracleuser> sqlplus /

SQL*Plus: Release 3.3.4.0.1 - Production on Wed Jul 16 12:46:22 2003

Copyright (c) Oracle Corporation 1979, 1996.  All rights reserved.


Connected to:
Oracle7 Server Release 7.3.4.5.0 - Production
With the distributed, replication and parallel query options
PL/SQL Release 2.3.4.5.0 - Production

SQL-SSESMADT001-E73GC04>select * from x;
select * from x
              *
ERROR at line 1:
ORA-00942: table or view does not exist
it´s environment variable