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set serveroutput on
create or replace procedure print as
begin 
  dbms_output.put_line('abc');
end;

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SQL> set serverout on
SQL> call print();

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exec print;

SQL code:
16:27:43 scott@TUNGKONG> set serveroutput on
16:27:53 scott@TUNGKONG> create or replace procedure print as
16:27:58 2 begin
16:27:58 3 dbms_output.put_line('abc');
16:27:58 4 end;
16:27:58 5 /

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16:28:00 scott@TUNGKONG> call print();
abc

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.................

SQL code:

SQL> conn sys/admin as sysdba
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SQL> create or replace procedure print as
2 begin
3 dbms_output.put_line('abc');
4 end;
5 /

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SQL> set serverout on;
SQL> call print();
abc

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