command line - adding PATH with SETX or PATHMAN or something else?

I am trying to add a PATH from command line, as with SETX %PATH%... it always expands the PATH, which I don't want.

PATHMAN is exactly for this purpose, but it doesn't work for me on Windows 7. It freezes most of the times, and it doesn't check for duplicated.

There must be a tool for managing PATH variables in the proper way. SETX would be perfect, but maybe not with the %PATH% syntax.

Answer

See the article Edit the PATH environment variable in Windows without pain.

It recommends using pathed :

For example, say that you have your Sysinternal tools in C:\Bin\Sysinternals and you want to add them to the PATH. Simply do:
pathed /append C:\Bin\Sysinternals /machine
If you want to add them to the user PATH system instead, then do:
pathed /append C:\Bin\Sysinternals /user

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