Search notes:

SQL*Plus: SET SHOWMODE

If set to on, SQL*Plus will print the old and new value of an SQL*Plus system variable when modifying it with set. 
SQL> set long 42
SQL> set showmode on
new: showmode BOTH
SQL> set long 99
old: long 42
new: long 99
SQL> old: showmode BOTH

See also

The set command.

Index

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