ESXi Shell is a VMware vSphere command-line interface (CLI) for troubleshooting..
ESXi Shell, which was formerly known as Tech Support Mode (TSM), is disabled by default. Only the root user and system administrators can execute system commands using the ESXi Shell.
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VMware recommends that administrators install the vCLI page or deploy the vMA virtual appliance to run commands against ESXi hosts. ESXCLI commands that are available in the ESXi Shell are also included in the vCLI package.