#!/bin/sh -u
#
#     $0 pathname
#
# A script that identifies if the file given on the command line is empty.
# Nonexistent and non-files are ignored.
#
# WARNING: Many of the comments in this file are "Instructor-Type"
#   comments and are *not* appropriate for real scripts.  Do not put
#   "Instructor-Type" comments into the scripts that you submit for marking.
#   I put them in my example files because I am teaching you how to
#   write scripts; do not submit my teaching comments back to me again.
#   Read the week7.txt notes for more details on good comment style.
#
# -IAN! idallen@ncf.ca  June 2001

# All scripts must start with lines similar to these two:
#
export PATH=/bin:/usr/bin
umask 022

# Validate the script arguments.
# Output what the extra arguments were, to help the user.
#
if [ "$#" -ne 1 ]; then
	echo 1>&2 "$0: Expecting exactly one argument; found $# ($*)"
	exit 1
fi

# We only process existing files and ignore otherwise.
#
if [ ! -f "$1" ]; then
	echo 1>&2 "$0: Argument '$1' is not an existing file name"
	exit 1
fi

# At this point in the script, we know the file exists.
# We only check if it is not empty (has non-zero size).
#
if [ -s "$1" ]; then
	echo "'$1' is not empty"
else
	echo "'$1' is empty"
fi

exit 0