#!/bin/sh -u
#  $0 [ strings...]
# A script that looks for strings in the password file.
#
# 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  October 2001

export PATH=/bin:/usr/bin
umask 022

file=/etc/passwd

# Loop for each command line argument.
# This "for" loop defaults to using "$@".
#
for string do
	# The command line following "if" and "while" can be any
	# Unix command.  The return status is checked.
	# I redirect output to /dev/null to throw it away.
	#
	if grep -e "$string" "$file" >/dev/null ; then
		echo "String '$string' is in $file"
	else
		echo "Cannot find '$string' in $file"
	fi
done