Welcome to PolyHub EVO!
PolyHub is an Engineering Virtual Organization with the goal to
initiate and catalyze fundamental research of the physical phenomena
associated with polymer dynamics on a global scale.
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.
- Related: HTTP_HOST, REMOTE_ADDR, REMOTE_PORT, REMOTE_USER