csh alias with variable number of arguments

Question

I would like to create a csh alias that performs one operation if invoked without arguments and a second operation if invoked with a single argument. Does anyone know how to do

Answer 1

Easy to do - sorry I'm late to the party.

alias iftest    'if (\\!:0 != \\!:$) echo "Last arg="\\!:$;if (\\!:0 == \\!:$) echo "No args given."'

This merely checks whether the 0th argument (=the 'iftest' itself) and the last arguments are the same, and if they are, assumes there is no argument. This is, of course, not necessarily true, but hopefully works in praxis.