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ENV{"varname"} -- inspect the value of an environment variable
- Returns the current value of the environment variable in the CGI (Common Gateway Interface) environment. This is the environment that the TWiki scripts run in on the web server.
- Note: For security reasons, only those variables whose names match the regular expression in
{AccessibleENV} in the Security Settings/Miscellaneous section of configure can be displayed. Any other variable will just be shown as an empty string, irrespective of its real value.
- Example:
%ENV{MOD_PERL}% displays as: not set
- If a variable is undefined (as against being set to the empty string) it will be returned as
not set.
- Category: SystemInformationVariables
- Related: HTTP_HOST, REMOTE_ADDR, REMOTE_PORT, REMOTE_USER
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