I typically look for $ENV{'SERVER_NAME'} or other items that are set automatically by the webserver, with the assumption that most people's shell won't have it set. Another good one to check might be $ENV{'GATEWAY_INTERFACE'}.

In reply to Re^2: Telling if your script is running from web page or CLI by jhourcle
in thread Telling if your script is running from web page or CLI by dizzyg

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