#!/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.
#
# NOTE: This script fragment is incomplete - it does not follow all
# the script guidelines set out in "script_style.txt".
#
# -IAN! idallen@idallen.ca

# 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