#!/bin/csh -fxv
#
# Note the quotes on $argv[1] which are necessary because if 
# $1 is of the form -abc... then the if statement gets confused
# if the quotes are not present EVEN THOUGH THE EXPANSION IS IDENTICAL.
#
if ( $#argv == 0 ) then
	echo "$0"\:" Usage: $0 any argument"
	exit 1
else if ( "$argv[1]" =~ -[a-zA-Z] ) then
#else if ( $argv[1] =~ -[a-zA-Z] ) then
	echo -n "You used a flag ($argv[1]). But in this"
	echo " program flags are just for fun"
	exit 0
else if ( "$argv[1]" !~ [a-zA-Z]* ) then
#else if ( $argv[1] !~ [a-zA-Z]* ) then
	echo "$argv[1] does not begin with a letter."
	exit 0
else
	echo "You gave an argument ($argv[1])"
	if ( -e "$argv[1]" ) echo "It was a file"
#	if ( -e $argv[1] ) echo "It was a file"
	exit 0
endif