Login shell?

[M. A. Sridhar]

Is there any way to determine, within a shell script (csh), whether the script 
is being executed by the login shell? I know that one can use the fact that
$prompt is set to detect an interactive shell, but I don't know how to test
whether it's the login shell.

Thanks in advance.
					- Sridhar

-- 
M. A. Sridhar                  | 
Department of Computer Science | ncr-sd!ncrcae ! usceast!sridhar (USENET)
University of South Carolina   | sridhar at cs.scarolina.edu (CSNET)
Columbia, SC 29208             | (803) 777-2427 (Ma Bell)