He rightly pointed to the deprecated 'SET SCAN OFF' and the current 'SET DEFINE OFF' to fix his problem.
We support a lot of plus parameters in SQL*Plus and are adding more on each release. For now, though, if you are using SQLDeveloper and are looking for the current settings in the worksheet, you can use the 'show all' command which shows the state of any parameters that are in force at that time.
e.g., The default will give you this.
appinfo is OFF and set to "SQL Developer"
FEEDBACK ON for 6 or more rows
USER is HR
For supported SQL*Plus commands you can also use 'help' command which lists the commands supported. e.g.,
For help on a topic type help
List of Help topics available:
I'll follow this up with another post of the SQLDeveloper 3.1 functionality where we are supporting more of the printing functionality around column formatting and titles.