#!/bin/sh -u
# Display on standard error the individual arguments on the command line.
# ------------------------------------------------------------------
# Syntax:
#   $0 [args...]
# ------------------------------------------------------------------
# Purpose: Count and display each argument to this shell script.
#    It also displays the command name, which is often referred to as
#    "Argument Zero" ($0) but is never counted as a command argument.
#    All output appears on "standard error", not "standard output".
# ------------------------------------------------------------------
# Student Name:                   Ian! D. Allen
# Algonquin EMail Address:        alleni
# Student Number:                 000-000-000
# Course Number:                  XXX 0000
# Lab Section Number:             099
# Professor Name:                 Dennis Ritchie & Brian Kernighan
# Assignment Name/Number/Date:    Exercise 123, due Sept 1, 2010
# Comments:                       This is a sample assignment label.
# ------------------------------------------------------------------

# I! Comments flagged with "I!" are "instructor-style" comments that
# I! explain some aspect of script writing to people who are new to it.
# I! Since these comments explain things that are obvious to someone who
# I! understands scripts, they are not comments that should appear in
# I! production code, or in code submitted by students for marking.
# I! Delete all I! comments from any code you hand in.

# Set the search path for the shell to be the standard places.
# Set the character collating sequence to be numeric ASCII/C standard.
# Set the language and character set to be ASCII/C standard.
# Set the umask to be non-restrictive and friendly to others.
#
PATH=/bin:/usr/bin ; export PATH
LC_COLLATE=C ; export LC_COLLATE
LANG=C ; export LANG
umask 022

# I! The $0 variable contains the name of this script, sometimes called
# I! "argument zero".  It is not an argument to the script itself.
# I! The $# variable contains a count of the number of command line arguments.
# I! The script name is not counted as an "argument" to the script;
# I! only arguments 1 and up are counted as arguments to the script.
# I! The syntax "1>&2" means "on this line, send what would normally appear
# I! on stdout to stderr" - the output of the line goes to stderr.
#
echo 1>&2 "$0: This script has $# command line arguments."
echo 1>&2 "Argument 0 is [$0]"

# Now display all of the command line arguments (if any).
# These ($1, $2, etc.) are the real command line arguments to this script.
#
count=0
for arg do
    count=$(( $count+1 ))
    echo 1>&2 "Argument $count is [$arg]"
done

# I! zero is a good/success return status for a command that succeeds.
#
exit 0