To connect to VMWare ESXi using PowerCLI:

1. Download and install PowerCLI from www.vmware.com.
2. In PowerCLI, using the following command to connect to your ESXi hypervisor:

Connect-VIServer -Server server_name -User username -Password password

3. Use the Get-VM command to list the Virtual Machines installed on the hypervisor.

Get-VM

Name             PowerState   Num  CPUs  MemoryGB
----             -----------  ---  ----  --------
CentOS-FS1       PowerOn      1          1.000
Windows-WebSrv   PowerOff     1          4.000