#! /bin/sh

# Question 3:

# Write a script that prints an error message and exits if a lockfile
# exists.  A lockfile is a file in the /tmp directory, with a name
# equal to the basename of the script, followed by the string,
# ``.lock'' For example, if the name of the script is lockit, then the
# name of the lockfile shall be /tmp/lockit.lock

prog=$(basename $0)
lockfile="/tmp/${prog}.lock"
if [ -e "$lockfile" ]
then
    echo "lockfile exists"
    exit 1
else
    echo "No existing lockfile"
fi

# just to help in testing:
sleep 60