[oracle@db01 34765931]$ $ORACLE_HOME/OPatch/opatch apply
Oracle Interim Patch Installer version 12.2.0.1.36
Copyright (c) 2023, Oracle Corporation.  All rights reserved.


Oracle Home       : /u01/app/oracle/product/19.3.0/dbhome_1
Central Inventory : /u01/app/oraInventory
   from           : /u01/app/oracle/product/19.3.0/dbhome_1/oraInst.loc
OPatch version    : 12.2.0.1.36
OUI version       : 12.2.0.7.0
Log file location : /u01/app/oracle/product/19.3.0/dbhome_1/cfgtoollogs/opatch/opatch2023-01-19_12-00-24PM_1.log

Verifying environment and performing prerequisite checks...
Prerequisite check "CheckSystemCommandAvailable" failed.
The details are:
Missing command :fuser
UtilSession failed: 
Prerequisite check "CheckSystemCommandAvailable" failed.
Log file location: /u01/app/oracle/product/19.3.0/dbhome_1/cfgtoollogs/opatch/opatch2023-01-19_12-00-24PM_1.log

OPatch failed with error code 73

解决方案http://www.cndba.cn/hbhe0316/article/116418

[root@db01 ~]# yum install psmisc -y

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