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SQL*Plus: SET TERMOUT

set termout off prevents text (results of queries, prompt etc.) from being written (echo'ed) to the terminal if the text originates from a statement in an SQL script started with start, @ or @@.
Output whose origin is a statement that is typed interactively or redirected (STDOUT | STDIN) to SQL*Plus is not affected by the value of termout.
In order to display text again, set termout on must be used.

See also

set echo
set feedback
spool sends the output that is normally written to the console also to a file (or printer).

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