how do I tell inside .cshrc if I'm a login shell?

[Maarten Litmaath]

I use a scheme like this.
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# .cshrc

if (! $?CSHLEVEL) then
	setenv	CSHLEVEL	0
	set	home = ~username	# just to be sure
	source ~/.env			# environment stuff we always want
else
	set	tmp = $CSHLEVEL
	@ tmp++
	setenv	CSHLEVEL	$tmp
endif

# exit from .cshrc if not interactive, e.g. under rsh (BSD)
if (! $?prompt) exit

# aliases
# set variables

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# .env

# umask
# setenv variables

----------------------------------------

# .login

# terminal setup
# startup favourite window environment
--
   "UNIX was never designed to keep people from doing stupid things, because
    that policy would also keep them from doing clever things."  (Doug Gwyn)