9.20 SHOW option
Shows the value of a SQLcl system variable, or the current SQLcl
                environment. Enter any system variable set by the SET command in place of
                        system_variable. SHOW SGA can only be used by a DBA
                user. Use one of the following terms or clauses in place of
                    option:
                  
- system_variable
- ALL
- BTI[TLE]
- CON_ID
- CON_NAME
- CONNECTION
- DDL
- EDITION
- ENCODING
- ENCODINGS
- ERR[ORS] [ {FUNCTION | PROCEDURE | PACKAGE | PACKAGE BODY | TRIGGER | VIEW | TYPE | TYPE BODY | DIMENSION | JAVA CLASS} [schema.]name]
- INSTANCE
- JAVA
- JDBC
- LNO
- NLS
- PARAMETER[S] [parameter_name]
- PDBS
- PNO
- RECYC[LEBIN] [original_name]
- REL[EASE]
- 
                        REPF[OOTER]
- 
                        REPH[EADER]
- SGA
- SPOO[L]
- SPPARAMETER[S] [parameter_name]
- SQLCODE
- SQLPATH
- TNS
- TTI[TLE]
- USER
- VERSION
SHOW ENCODING
Shows the encoding which is set for the client.
SHOW ENCODINGS
Shows the available encodings for the client.