#!/bin/sh -u
# Perform several tests on the first argument to this script.
#------------------------------------------------------------
# Syntax:  $0 [filename]
#------------------------------------------------------------
# Purpose:  Perform several tests on a pathname argument.
#    If no arguments, do the tests on /etc/passwd instead.
#------------------------------------------------------------
# Student Name:                  Ian! D. Allen
# Algonquin EMail Address:       alleni
# Student Number:                000-000-000
# Course Number:                 DAT2330
# Lab Section Number:            010
# Professor Name:                Ian! D. Allen
# Assignment Name/Number/Date:   Sample Assignemnt Label
# Comment:                       This is a sample assignment label.
#      see http://teaching.idallen.com/assignment_standards.html
#-------------------------------------------------------------

# Set the search path for the shell to be the standard places.
# Set the umask to be non-restrictive and friendly to others.
#
PATH=/bin:/usr/bin ; export PATH
umask 022

# First, find out which pathname we are going to be testing.
# If there is no command line argument, use a built-in pathname.
# (This could use an "elif" to avoid nesting the two IF statements.)
#
if [ $# -eq 0 ] ; then
	# use a default because first argument is missing
	path="/etc/passwd"
	echo "Script has no arguments; using default path: $path"
else
	if [ $# -eq 1 ] ; then
		# use the first argument as the pathname
		path="$1"
		echo "Using first argument: $1"
	else
		echo 1>&2 "$0: Expecting 1 optional pathname argument," \
		     "found $#: ($*)"
		exit 1
	fi
fi
echo "You are using pathname '$path'."

if [ -e "$path" ] ; then
	echo "The path '$path' exists"
else
	echo "The path '$path' does not exist" \
		"(or is missing or inaccessible)"
fi

if [ -d "$path" ] ; then
	echo "The path '$path' is a directory"
else
	echo "The path '$path' is not a directory" \
		"(or is missing or inaccessible)"
fi

if [ -f "$path" ] ; then
	echo "The path '$path' is a plain file"
else
	echo "The path '$path' is not a plain file" \
		"(or is missing or inaccessible)"
fi

if [ -r "$path" ] ; then
	echo "The path '$path' is readable"
else
	echo "The path '$path' is not readable" \
		"(or is missing or inaccessible)"
fi

if [ ! -w "$path" ] ; then
	echo "The path '$path' is not writable" \
		"(or is missing or inaccessible)"
else
	echo "The path '$path' is writable"
fi

if [ ! -x "$path" ] ; then
	echo "The path '$path' is not executable" \
		"(or is missing or inaccessible)"
else
	echo "The path '$path' is executable"
fi

# exit with a good return code
#
exit 0