Commands not work on my ESXi.

Hello Folks.

How are you?

I use SSH for loggin to the ESXi and when I want to run Available Commands, ESXi tell me that command not found!!!

I use "su" command to become root but commands not worked.

$ esxcli

-bash: esxcli: command not found

$ su

Password:

# esxcli

bash: esxcli: command not found

#

How can I solve it?