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This doesnt seem to work in .htacces:

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up vote 0 down vote accepted

It depends what you want to do.

In order to pass them to the CGI scripts, you can access the environment variables with PassEnv.

With mod_rewrite, you can access them with the %{ENV:blah} form.

There are no other ways to access the Unix environment variables.

To manipulate Apache environment variables, you may want to check the documentaton

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