I want to set a Windows Environment Variable for my whole user login session

Use setx to permanently set an environment variable

If you’ve used windows environment variables at all, you’ve probably wished you could set them in a command window for use in another program.
You can’t change the environment of an already-running program – the environment is copied when a program starts – but you can set environments values for your user session that will be picked up by any new programs you launch with setx:

setx myvariable thenewvalue

Much easier than right-clicking to get to My Computer properties.
setx /? will also tell you about setting permanent, machine-wide and remote machine environment values.

setx comes with Windows 7 or in the Windows Resouce Kit.

How to unset a variable set with setx

setx myvariable ""

See http://support.microsoft.com/kb/195050 for more details.

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