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Use it when logging in to the database today! Sql login

[oracle@p520b] $! sql

Sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Wed Feb 20 10:40:07 2019

Copyright (c) 1982, 2013, Oracle. All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0-64bit Production

With the Partitioning, Oracle Label Security, OLAP, Data Mining

Oracle Database Vault and Real Application Testing options

SYS@gbps >

! The exclamation point "sql" in shell calls commands executed in history directly. It can be a number or a string. Sql refers only to recent commands that begin with sql.

You can't do "! sql" after emptying .bash _ history.

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