#!/bin/ksh
					#
					#      kgrep - Korn Shell grep program
					#
					# Declare default flags
					CFLAG= IFLAG= LFLAG= NFLAG= SFLAG= VFLAG=
					integer LNUM=0 COUNT=0 TOT_COUNT=0
					# Disable file name generation
					set -f
					# Check usage
					if (($# < 2))
					then
					print "Usage: $0 [options] expression files"
					exit 1
					fi
					# Parse command-line options
					while true
					do
					case $1 in
					-b* )  print "b option not supported" ;;
					-c* )  CFLAG=1 ;;
					-i* )  IFLAG=1 ;;
					-l* )  LFLAG=1 ;;
					-n* )  NFLAG=1 ;;
					-s* )  SFLAG=1 ;;
					-v* )  VFLAG=1 ;;
					-* )          print "$0: unknown flag $1"
					exit 2 ;;
					* )           PATTERN=$1
					shift
					break ;;
					esac
					shift
					done
					# Set no-print flags
					NOPRINT=$VFLAG$CFLAG$LFLAG
					V_NOPRINT=$CFLAG$LFLAG
					# Set upper/lower pattern
					typeset -u UCPATTERN=$PATTERN
					typeset -l LCPATTERN=$PATTERN
					# Check for file arg
					if (($# == 0))
					then
					print "Must have file argument"
					exit 1
					fi
					# Process files
					for FILE
					do
					# Open file for standard input
					exec 0<$FILE
					# Read each line in file
					while read -r LINE
					do
					# Increment line number counter
					((LNUM+=1))
					# Check each line for the pattern
					case $LINE in
					# See if PATTERN matches input
					*$PATTERN*)
					if [[ $VFLAG = "" ]]
					then
					[[ $NOPRINT = "" ]] &&  
					print -r "${NFLAG:+$LNUM:}$LINE"
					((COUNT+=1))
					fi ;;
					# For -i option: See if
					# upper/lowercase patterns match
					*$UCPATTERN* | *$LCPATTERN*)
					if [[ $IFLAG != "" ]]
					then
					if [[ $VFLAG = "" ]]
					then
					[[ $NOPRINT = "" ]] &&  
					print -r "${NFLAG:+$LNUM:}$LINE"
					((COUNT+=1))
					fi
					else
					if [[ $VFLAG != "" ]]
					then
					[[ $V_NOPRINT = "" ]] && 
					print -r "${NFLAG:+$LNUM:}$LINE"
					((COUNT+=1))
					fi
					fi ;;
					# For -v option: See if
					# pattern doesn't match
					!(*$PATTERN*))
					if [[ $VFLAG != "" ]]
					then
					[[ $V_NOPRINT = "" ]] &&  
					print -r "${NFLAG:+$LNUM:}$LINE"
					((COUNT+=1))
					fi ;;
					esac
					done
					# Process -l flag
					# Display just the filename
					# if there are matches in this file
					if [[ $LFLAG != "" ]] && ((COUNT))
					then
					print - $FILE
					fi
					# Increment the total match counter
					# for when kgrep'ing multiple files
					((TOT_COUNT+=COUNT))
					# Reset the line number counter for the next file
					LNUM=0
					# Reset the match counter for the next file
					COUNT=0
					done
					# Process -c flag
					# Display the total number of matches found
					[[ $CFLAG != "" ]] && print $TOT_COUNT
					# Exit successfully
					exit 0