By using vSphere CLI, you can upgrade a ESXi 5.5 host or ESXi 6.0 host to version 6.5 and update or patch ESXi 5.5, ESXi 6.0, and ESXi 6.5 hosts.
To use esxcli commands for vCLI , you must install vSphere CLI (vCLI). For more information about installing and using the vCLI, see the following documents:
Getting Started with vSphere Command-Line Interfaces
vSphere Command-Line Interface Concepts and Examples
vSphere Command-Line Interface Reference is a reference to vicfg- and related vCLI commands.
If you press Ctrl+C while an esxcli command is running, the command-line interface exits to a new prompt without displaying a message. However, the command continues to run to completion.
For ESXi hosts deployed with vSphere Auto Deploy, the tools VIB must be part of the base booting image used for the initial Auto Deploy installation. The tools VIB cannot be added separately later.