#!/bin/csh
# Demonstration of a switch control structure.
# This routine tests the first command-line argument
# for yes or no in any combination of upper- and
# lowercase letters.
#
# test that argv[1] exists
if ($#argv != 1) then
	echo "Usage: switch_1 [yes|no]"
	exit 1
else
# argv[1] exists, set up switch based on its value
	switch ($argv[1])
	# case of YES
		case [yY][eE][sS]:
		echo "Argument one is yes."
		breaksw
	#
	# case of NO
		case [nN][oO]:
		echo "Argument one is no."
	breaksw
	#
	# default case
		default:
		echo "Argument one is neither yes nor no."
		breaksw
	endsw
endif