interno:~# export TNS_ADMIN=/usr/lib/oracle/xe/app/oracle/product/10.2.0/client/lib/
interno:~# export LD_LIBRARY_PATH=/usr/lib/oracle/xe/app/oracle/product/10.2.0/client/lib/

interno:~# isql -v XE admin password
+---------------------------------------+
| Connected!                            |
|                                       |
| sql-statement                         |
| help [tablename]                      |
| quit                                  |
|                                       |
+---------------------------------------+
SQL>