How to update system PATH variable permanently from cmd?

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Type setx /? to get basic command help. You’ll easily discover:

/M                     Specifies that the variable should be set in
                       the system wide (HKEY_LOCAL_MACHINE)
                       environment. The default is to set the
                       variable under the HKEY_CURRENT_USER
                       environment.

You need to run this from an elevated command prompt. Right-click the cmd shortcut and select Run as Administrator.

E.g.

setx /M PATH "%PATH%;C:\Something\bin"

Caution:

We may destroy the current system’s PATH variable. Make sure you backup its value before you modify it.

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