How to update system PATH variable permanently from cmd?

Question

We can use setx as discussed here.

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

But this command can just make changed to user PATH variable not the system one.

How can we make a similar system wide command?

Answer 1

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.