Note that setting / removing machine-level variables ( 'Machine') requires elevation (running as admin).īy design, any of the following values causes the specified environment variable to be deleted: '', ::Value (the equivalent of null in C# ), "`0" (a single NUL ( 0x0) char.) These statements - assuming they execute without triggering an exception - do remove the persistent definitions (on Windows only). Note that these methods remove only the persistent definitions of these variables - any definitions in the current session (process) are left untouched to also remove them, use the methods at the top.
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