#! /bin/sh

# Question 4:

# Modify your answer to question 3 so that the lockfile will be
# /var/lock/subsys/basename of script.lock if the user executing it is
# root, /tmp/basename of script.lock otherwise.

prog=$(basename $0)
uid_num=$(id -u)

lockfile="/tmp/${prog}.lock"
[ "$uid_num" -eq 0 ] && lockfile=/var/lock/subsys/${prog}.lock
if [ -e "$lockfile" ]
then
    echo "lockfile exists"
    exit 1
else
    echo "No existing lockfile"
fi

# just to help in testing:
sleep 60