ruby/grep.rb


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#!/usr/bin/env ruby

exit 1 if ARGV.size < 2

pattern = ARGV[0]

ARGV[1..-1].each do |fname|
	unless File.file?(fname)
		puts "File #{fname} does not exist or is a directory"
		exit 1
	end
	File.open(fname, 'r') do |f|
		f.each_line do |line|
			puts "#{f.lineno}:\t#{line}" if line =~ /#{pattern}/
		end
	end
end