今天在登陆数据库的时候使用！sql登录

[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>

！sql这个感叹号在shell中是直接调用history中执行过的命令，可以是数字，也可以是字符串，!sql就只引用最近以sql开头的命令

你把.bash_history清空再执行"!sql"就不行了