Red Hat ENTERPRISE LINUX 4 System Administration Manual page 258

Chapter 24. Apache HTTP Server Configuration
Figure 24.5. Environment Variables
To remove an environment variable so that the value is not passed to CGI scripts and SSI pages,
use the Unset for CGI Scripts section. Click Add in the Unset for CGI Scripts section, and enter
the name of the environment variable to unset. Click OK to add it to the list. This corresponds to the
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directive.
UnsetEnv
To edit any of these environment values, select it from the list and click the corresponding Edit button.
To delete any entry from the list, select it and click the corresponding Delete button.
To learn more about environment variables in the Apache HTTP Server, refer to the following:
http://httpd.apache.org/docs-2.0/env.html
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http://httpd.apache.org/docs-2.0/mod/mod_env.html#unsetenv
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