#!/bin/sh
#Sample answer for SA course
if [ $# -ne 1 ]; then
	echo -n "Please enter a username: "
	read un
else
	un=$1
fi

if grep $un /etc/passwd > /dev/null; then
	echo $un is present in the /etc/passwd file
else
	echo $un is not present in the /etc/passwd file
fi

if who | grep $un > /dev/null; then
	echo $un is logged in
else
	echo $un is not logged in
fi