![]() 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. 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). ![]() ::SetEnvironmentVariable('HTTPS_PROXY', '', 'Machine') ::SetEnvironmentVariable('HTTP_PROXY', '', 'Machine') ![]() ::SetEnvironmentVariable('HTTP_PROXY', '', 'User') If they're defined persistently, via the registry (on Windows), they will resurface in future sessions. These statements remove the specified environment variables from the current session (process) only (note that on Unix-like platforms you'd have to use alias ri instead of rm, or use the cmdlet's full name, Remove-Item, instead).
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