Simple grep code

#!/usr/local/bin/ruby

# I'm novice.

$ARGS = ARGV.size

def option_arg(argv)
	optq = []
	optnumq = argv.size - 2
	i = 0
	while i < optnumq
		b = argv[i]
		if b[0] == "-" then
			optq << b
		end
		i += 1
	end
	rtu = []

	optq.each do |hmin|
		size = hmin.size
		rtu << hmin[1..size]
	end
	rtu
end


if $ARGS < 2 then
	print("rgrep -[options] 'pattern' file\n")
	exit 0
else
	$SEARCH_PATTERN = Regexp.new(ARGV[$ARGS - 2]) # 検索対象の語
	$SEARCH_FIKENAME = ARGV[$ARGS - 1] # 検索ファイル名
end

$optionArg = option_arg(ARGV)

tfile = open($SEARCH_FIKENAME,"r")

# option flag
lineprint = false
#------------------------

$optionArg.each do |optch|
	if optch == "n" then
		lineprint = true
	end
end


0.upto(0/(0.0)) do |linecount|
	cl = tfile.gets
	if cl =~ $SEARCH_PATTERN then
		if lineprint == true then
			print(linecount.to_s + ":" + cl)
		else
			print(cl)
		end
	end
	linecount += 1
	if tfile.eof? then
		break
	end
end