How to Connect to PDB as sysdba using OS Authentication

How to connect to PDB directly as SYSDBA using OS Authentication

The secret to this is environment variable ORACLE_PDB_SID

SQL> show pdbs
    CON_ID CON_NAME                       OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------
         2 PDB$SEED                       READ ONLY NO
         3 PDB01 READ WRITE NO
         4 PDB02 READ WRITE NO
SQL>

$ export ORACLE_PDB_SID=PDB01
$ sqlplus / as sysdba

SQL*Plus: Release 19.0.0.0.0 - Production on Wed May 13 11:22:50 2020
Version 19.3.0.0.0
Copyright (c) 1982, 2019, Oracle. All rights reserved.

Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0

SQL> show con_name
CON_NAME
------------------------------
PDB01

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