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To upgrade agents using the command line, use the agent_upgrade tool as follows:
List all the agents with outdated software:
/var/ossec/bin/agent_upgrade -l
[root@wazuh-server wazuh-user]# /var/ossec/bin/agent_upgrade -l
ID    Name                                Version                  Â
001   zyberpatrol-pdc                     Wazuh v4.7.1  Â
Upgrade the agent with ID 001 using the ‘-a’ parameter followed by the agent ID:
/var/ossec/bin/agent_upgrade -a 001
[root@wazuh-server wazuh-user]# /var/ossec/bin/agent_upgrade -a 001
Upgrading…
Upgraded agents:
       Agent 001 upgraded: Wazuh v4.7.1 -> Wazuh v4.7.3
The agent is automatically restarted after the upgrade. Verify the agent version to ensure it has been properly upgraded using the below command:
/var/ossec/bin/agent_control -i 001
[root@wazuh-server wazuh-user]# /var/ossec/bin/agent_control -i 001
Wazuh agent_control. Agent information:
  Agent ID:   001
  Agent Name: zyberpatrol-pdc
  IP address: any
  Status:     Active
  Operating system:    Microsoft Windows Server 2022 Standard Evaluation
  Client version:      Wazuh v4.7.3
  Configuration hash:  ab73af41699f13fdd81903b5f23d8d00
  Shared file hash:    4a8724b20dee0124ff9656783c490c4e
  Last keep alive:     1712982456
  Syscheck last started at:  Sat Apr 13 04:26:16 2024
  Syscheck last ended at:    Sat Apr 13 04:26:43 2024