Read binary file in ruby and print hex output

gistfile1.rb

#!/usr/bin/ruby
require 'getoptlong'



filename = ""
blocksize = 1024
opts = GetoptLong.new(
	[ "-f", "--file", GetoptLong::REQUIRED_ARGUMENT],
	[ "-b", "--block", GetoptLong::REQUIRED_ARGUMENT]
)

opts.each{|o,a|
	case o
	when '-f', "--file"
		filename = a
	when 'b', '--block'
		blocksize = a.to_i
	end
}

open(filename,"rb"){|f|
	str = ""
	while buf = f.read(blocksize)
		0.upto(buf.size-1){|i|
			str+= "0x"+(buf[i].to_s(16))+" "
		}
	end
	puts str;
}