[Solved] Pre requisite check “checksystemcommandavailable” failed

[oracle@db1 ~]$ /u01/app/oracle/product/11.2.0/db_1/OPatch/opatch apply -oh /u01/app/oracle/product/11.2.0/db_1  -local /soft/22646198/22502456
Oracle Interim patch installer version 11.2.0.3.29
Copyright (c) 2021, Oracle Corporation. all rights reserved.


Oracle home directory: /u01/app/oracle/product/11.2.0/db_1
Main product list: /u01/app/oraInventory
    From: /u01/app/oracle/product/11.2.0/db_1/oraInst.loc
OPatch version: 11.2.0.3.29
OUI version: 11.2.0.4.0
Log file location:/u01/app/oracle/product/11.2.0/db_1/cfgtoollogs/opatch/opatch2021-11-05_08-58-35AM_1.log

Verifying environment and performing prerequisite checks...
Prerequisite check "CheckSystemCommandAvailable" failed.
The details are:
Missing command :fuser
Prerequisite check "CheckSystemCommandAvailable" failed.
The details are:
Missing command :fuser
Prerequisite check "CheckSystemCommandAvailable" failed.
The details are:
Missing command :fuser
Prerequisite check "CheckSystemCommandAvailable" failed.
The details are:
Missing command :fuser
Prerequisite check "CheckSystemCommandAvailable" failed.
The details are:
Missing command :fuser
Prerequisite check "CheckSystemCommandAvailable" failed.
The details are:
Missing command :fuser
Prerequisite check "CheckSystemCommandAvailable" failed.
The details are:
Missing command :fuser
Prerequisite check "CheckSystemCommandAvailable" failed.
The details are:
Missing command :fuser
Prerequisite check "CheckSystemCommandAvailable" failed.
The details are:
Missing command :fuser
Prerequisite check "CheckSystemCommandAvailable" failed.
The details are:
Missing command :fuser
UtilSession Failed: 
Prerequisite check "CheckSystemCommandAvailable" failed.
Prerequisite check "CheckSystemCommandAvailable" failed.
Prerequisite check "CheckSystemCommandAvailable" failed.
Prerequisite check "CheckSystemCommandAvailable" failed.
Prerequisite check "CheckSystemCommandAvailable" failed.
Prerequisite check "CheckSystemCommandAvailable" failed.
Prerequisite check "CheckSystemCommandAvailable" failed.
Prerequisite check "CheckSystemCommandAvailable" failed.
Prerequisite check "CheckSystemCommandAvailable" failed.
Prerequisite check "CheckSystemCommandAvailable" failed.
Log file location: /u01/app/oracle/product/11.2.0/db_1/cfgtoollogs/opatch/opatch2021-11-05_08-58-35AM_1.log

OPatch failed with error code 73

Installation package:

yum install -y psmisc

Problem solving