#!/bin/sh
#this script first tests to see if you entered the correct number
#of command line args then proceeds through the if then elif structure

#this tests to see if $# is 3

#$$ this is the PID of the current process
echo $$

if test $# -eq 3

	then 
	echo you correctly entered 3 arguments

	
elif test $# -eq 2

	then 
	echo you only entered 2 arguments, please try again
	exit 2

#the exit code will set $? to a value of 1 for the shell
else
	echo you did not enter 3 command line arguments
	exit 1
	
fi

#<title>CSC128: Shell Script Examples - if-then-elif-else control structure  </title>