oracle调用的sql文件必须以sql结尾

今天我创建了一个sql文件，没有以sql为后缀，在调用的时候，会默认加sql后缀，然后报错说找不到文件，在sqlplus后面跟的@也是一样的，也会报同样的错误

SQL> ! cat /tmp/get_inst_num_sql
set head off;
set pagesize 0;
set feedback off;
set sqlblanklines off;
set newpage none;
select max(inst_id) from gv$instance;
exit;

SQL> @/tmp/get_inst_num_sql;
SP2-0310: unable to open file "/tmp/get_inst_num_sql.sql"


[oracle@slcm05adm04 bin]$ ./sqlplus "sys/cdb1@cdb1 as sysdba" @/tmp/get_inst_num_sql

SQL*Plus: Release 21.0.0.0.0 - Development on Sat Oct 10 08:15:27 2020
Version 21.1.0.0.0

Copyright (c) 1982, 2020, Oracle.  All rights reserved.


Connected to:
Oracle Database 21c Enterprise Edition Release 21.0.0.0.0 - Production
Version 21.1.0.0.0

SP2-0310: unable to open file "/tmp/get_inst_num_sql.sql"
SQL>

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